{"schema_version":1,"title":"Microsoft Office Online Server vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 33 vulnerabilities in Microsoft Office Online Server: 0 in the last 7 days and 32 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-55949, was published on 14 July 2026.","url":"https://junglewise.ai/threats/technologies/office-online-server","json_url":"https://junglewise.ai/threats/technologies/office-online-server.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/office-online-server","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":26,"all_time":33,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":32,"last_365_days":32},"latest":[{"cve":"CVE-2026-55949","cvss":7.8,"slug":"cve-2026-55949-microsoft-excel-use-of-uninitialized-resource-code-execution","title":"Microsoft Excel use of uninitialized resource code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:22.32+00:00","url":"https://junglewise.ai/threats/cve-2026-55949-microsoft-excel-use-of-uninitialized-resource-code-execution"},{"cve":"CVE-2026-55947","cvss":7.8,"slug":"cve-2026-55947-microsoft-office-excel-heap-buffer-overflow","title":"Microsoft Office Excel heap buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:22.05+00:00","url":"https://junglewise.ai/threats/cve-2026-55947-microsoft-office-excel-heap-buffer-overflow"},{"cve":"CVE-2026-55898","cvss":6.1,"slug":"cve-2026-55898-microsoft-office-excel-out-of-bounds-read","title":"Microsoft Office Excel out-of-bounds read","severity":"medium","exploited":false,"published_at":"2026-07-14T18:18:21.64+00:00","url":"https://junglewise.ai/threats/cve-2026-55898-microsoft-office-excel-out-of-bounds-read"},{"cve":"CVE-2026-55141","cvss":7.8,"slug":"cve-2026-55141-microsoft-office-excel-stack-based-buffer-overflow","title":"Microsoft Office Excel stack-based buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:21.123+00:00","url":"https://junglewise.ai/threats/cve-2026-55141-microsoft-office-excel-stack-based-buffer-overflow"},{"cve":"CVE-2026-55138","cvss":5.5,"slug":"cve-2026-55138-microsoft-excel-untrusted-pointer-dereference-information","title":"Microsoft Excel untrusted pointer dereference information disclosure","severity":"medium","exploited":false,"published_at":"2026-07-14T18:18:20.72+00:00","url":"https://junglewise.ai/threats/cve-2026-55138-microsoft-excel-untrusted-pointer-dereference-information"},{"cve":"CVE-2026-55137","cvss":7.8,"slug":"cve-2026-55137-microsoft-office-excel-heap-buffer-overflow","title":"Microsoft Office Excel heap buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:20.583+00:00","url":"https://junglewise.ai/threats/cve-2026-55137-microsoft-office-excel-heap-buffer-overflow"},{"cve":"CVE-2026-55136","cvss":7.8,"slug":"cve-2026-55136-microsoft-excel-untrusted-pointer-dereference-remote-code","title":"Microsoft Excel untrusted pointer dereference remote code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:20.437+00:00","url":"https://junglewise.ai/threats/cve-2026-55136-microsoft-excel-untrusted-pointer-dereference-remote-code"},{"cve":"CVE-2026-55131","cvss":7.8,"slug":"cve-2026-55131-microsoft-excel-heap-buffer-overflow-code-execution","title":"Microsoft Excel heap buffer overflow code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:19.717+00:00","url":"https://junglewise.ai/threats/cve-2026-55131-microsoft-excel-heap-buffer-overflow-code-execution"},{"cve":"CVE-2026-55122","cvss":7.1,"slug":"cve-2026-55122-microsoft-excel-out-of-bounds-read-information-disclosure","title":"Microsoft Excel out-of-bounds read information disclosure","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:18.5+00:00","url":"https://junglewise.ai/threats/cve-2026-55122-microsoft-excel-out-of-bounds-read-information-disclosure"},{"cve":"CVE-2026-55058","cvss":7.8,"slug":"cve-2026-55058-microsoft-excel-out-of-bounds-read-code-execution","title":"Microsoft Excel out-of-bounds read code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:18.087+00:00","url":"https://junglewise.ai/threats/cve-2026-55058-microsoft-excel-out-of-bounds-read-code-execution"},{"cve":"CVE-2026-55054","cvss":6.5,"slug":"cve-2026-55054-microsoft-excel-out-of-bounds-read-information-disclosure","title":"Microsoft Excel out-of-bounds read information disclosure","severity":"medium","exploited":false,"published_at":"2026-07-14T18:18:17.547+00:00","url":"https://junglewise.ai/threats/cve-2026-55054-microsoft-excel-out-of-bounds-read-information-disclosure"},{"cve":"CVE-2026-55053","cvss":7.8,"slug":"cve-2026-55053-microsoft-excel-heap-buffer-overflow-code-execution","title":"Microsoft Excel heap buffer overflow code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:17.41+00:00","url":"https://junglewise.ai/threats/cve-2026-55053-microsoft-excel-heap-buffer-overflow-code-execution"},{"cve":"CVE-2026-55048","cvss":7.8,"slug":"cve-2026-55048-microsoft-excel-integer-overflow-local-code-execution","title":"Microsoft Excel integer overflow local code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:16.68+00:00","url":"https://junglewise.ai/threats/cve-2026-55048-microsoft-excel-integer-overflow-local-code-execution"},{"cve":"CVE-2026-55044","cvss":7.8,"slug":"cve-2026-55044-microsoft-office-excel-out-of-bounds-read-code-execution","title":"Microsoft Office Excel out-of-bounds read code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:16.043+00:00","url":"https://junglewise.ai/threats/cve-2026-55044-microsoft-office-excel-out-of-bounds-read-code-execution"},{"cve":"CVE-2026-55041","cvss":7.8,"slug":"cve-2026-55041-microsoft-excel-heap-buffer-overflow-code-execution","title":"Microsoft Excel heap buffer overflow code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:15.57+00:00","url":"https://junglewise.ai/threats/cve-2026-55041-microsoft-excel-heap-buffer-overflow-code-execution"},{"cve":"CVE-2026-55039","cvss":7.8,"slug":"cve-2026-55039-microsoft-office-excel-integer-underflow-code-execution","title":"Microsoft Office Excel integer underflow code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:15.257+00:00","url":"https://junglewise.ai/threats/cve-2026-55039-microsoft-office-excel-integer-underflow-code-execution"},{"cve":"CVE-2026-55037","cvss":7.8,"slug":"cve-2026-55037-microsoft-office-excel-heap-buffer-overflow","title":"Microsoft Office Excel heap buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:14.883+00:00","url":"https://junglewise.ai/threats/cve-2026-55037-microsoft-office-excel-heap-buffer-overflow"},{"cve":"CVE-2026-55036","cvss":7.8,"slug":"cve-2026-55036-microsoft-excel-buffer-over-read-code-execution","title":"Microsoft Excel buffer over-read code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:14.7+00:00","url":"https://junglewise.ai/threats/cve-2026-55036-microsoft-excel-buffer-over-read-code-execution"},{"cve":"CVE-2026-55031","cvss":7.8,"slug":"cve-2026-55031-microsoft-excel-out-of-bounds-read-code-execution","title":"Microsoft Excel out-of-bounds read code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:14.013+00:00","url":"https://junglewise.ai/threats/cve-2026-55031-microsoft-excel-out-of-bounds-read-code-execution"},{"cve":"CVE-2026-55029","cvss":7.8,"slug":"cve-2026-55029-microsoft-excel-heap-buffer-overflow-in-file-parsing","title":"Microsoft Excel heap buffer overflow in file parsing","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:13.757+00:00","url":"https://junglewise.ai/threats/cve-2026-55029-microsoft-excel-heap-buffer-overflow-in-file-parsing"},{"cve":"CVE-2026-55025","cvss":7.8,"slug":"cve-2026-55025-microsoft-excel-type-confusion-code-execution","title":"Microsoft Excel type confusion code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:13.19+00:00","url":"https://junglewise.ai/threats/cve-2026-55025-microsoft-excel-type-confusion-code-execution"},{"cve":"CVE-2026-55024","cvss":7.8,"slug":"cve-2026-55024-microsoft-excel-type-confusion-code-execution","title":"Microsoft Excel type confusion code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:13.06+00:00","url":"https://junglewise.ai/threats/cve-2026-55024-microsoft-excel-type-confusion-code-execution"},{"cve":"CVE-2026-54131","cvss":7.8,"slug":"cve-2026-54131-microsoft-office-excel-use-after-free-code-execution","title":"Microsoft Office Excel use after free code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:09.123+00:00","url":"https://junglewise.ai/threats/cve-2026-54131-microsoft-office-excel-use-after-free-code-execution"},{"cve":"CVE-2026-50408","cvss":5.5,"slug":"cve-2026-50408-microsoft-excel-out-of-bounds-read-information-disclosure","title":"Microsoft Excel out-of-bounds read information disclosure","severity":"medium","exploited":false,"published_at":"2026-07-14T18:17:43.49+00:00","url":"https://junglewise.ai/threats/cve-2026-50408-microsoft-excel-out-of-bounds-read-information-disclosure"},{"cve":"CVE-2026-48580","cvss":5.5,"slug":"cve-2026-48580-microsoft-excel-untrusted-pointer-dereference-information","title":"Microsoft Excel untrusted pointer dereference information disclosure","severity":"medium","exploited":false,"published_at":"2026-07-14T18:17:20.033+00:00","url":"https://junglewise.ai/threats/cve-2026-48580-microsoft-excel-untrusted-pointer-dereference-information"}],"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":32},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"Microsoft Windows","slug":"windows-","vulnerabilities":963,"url":"https://junglewise.ai/threats/technologies/windows-"},{"name":"Microsoft Windows 10","slug":"windows-10","vulnerabilities":588,"url":"https://junglewise.ai/threats/technologies/windows-10"},{"name":"Microsoft Windows 11","slug":"windows-11","vulnerabilities":493,"url":"https://junglewise.ai/threats/technologies/windows-11"},{"name":"Microsoft Windows Server 2012","slug":"windows-server-2012","vulnerabilities":293,"url":"https://junglewise.ai/threats/technologies/windows-server-2012"},{"name":"Microsoft Windows Server 2016","slug":"windows-server-2016","vulnerabilities":213,"url":"https://junglewise.ai/threats/technologies/windows-server-2016"},{"name":"Microsoft Windows Server 2019","slug":"windows-server-2019","vulnerabilities":211,"url":"https://junglewise.ai/threats/technologies/windows-server-2019"},{"name":"Microsoft Windows 11 24h2","slug":"windows-11-24h2","vulnerabilities":192,"url":"https://junglewise.ai/threats/technologies/windows-11-24h2"},{"name":"Microsoft Windows Server 2022","slug":"windows-server-2022","vulnerabilities":178,"url":"https://junglewise.ai/threats/technologies/windows-server-2022"},{"name":"Microsoft Edge","slug":"edge-chromium-based","vulnerabilities":167,"url":"https://junglewise.ai/threats/technologies/edge-chromium-based"},{"name":"Microsoft Windows 11 25h2","slug":"windows-11-25h2","vulnerabilities":161,"url":"https://junglewise.ai/threats/technologies/windows-11-25h2"},{"name":"Microsoft Windows 11 Version 26H1","slug":"windows-11-version-26h1","vulnerabilities":135,"url":"https://junglewise.ai/threats/technologies/windows-11-version-26h1"},{"name":"Microsoft Windows Server 2025","slug":"windows-server-2025","vulnerabilities":124,"url":"https://junglewise.ai/threats/technologies/windows-server-2025"}],"technology":{"hub":true,"name":"Microsoft Office Online Server","slug":"office-online-server","vendor":{"name":"Microsoft","slug":"microsoft","url":"https://junglewise.ai/threats/vendors/microsoft"},"aliases":[],"category":"web-server","homepage":"https://learn.microsoft.com/en-us/officeonlineserver/office-online-server","description":"A server that provides browser-based versions of Microsoft Word, PowerPoint, Excel, and OneNote.","url":"https://junglewise.ai/threats/technologies/office-online-server"},"most_severe":[{"cve":"CVE-2025-49697","cvss":8.4,"epss":0.0062,"slug":"cve-2025-49697-microsoft-office-heap-overflow-code-execution","title":"Microsoft Office heap overflow code execution","severity":"high","exploited":false,"published_at":"2025-07-08T17:15:56.147+00:00","url":"https://junglewise.ai/threats/cve-2025-49697-microsoft-office-heap-overflow-code-execution"},{"cve":"CVE-2026-55949","cvss":7.8,"slug":"cve-2026-55949-microsoft-excel-use-of-uninitialized-resource-code-execution","title":"Microsoft Excel use of uninitialized resource code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:22.32+00:00","url":"https://junglewise.ai/threats/cve-2026-55949-microsoft-excel-use-of-uninitialized-resource-code-execution"},{"cve":"CVE-2026-55947","cvss":7.8,"slug":"cve-2026-55947-microsoft-office-excel-heap-buffer-overflow","title":"Microsoft Office Excel heap buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:22.05+00:00","url":"https://junglewise.ai/threats/cve-2026-55947-microsoft-office-excel-heap-buffer-overflow"},{"cve":"CVE-2026-55141","cvss":7.8,"slug":"cve-2026-55141-microsoft-office-excel-stack-based-buffer-overflow","title":"Microsoft Office Excel stack-based buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:21.123+00:00","url":"https://junglewise.ai/threats/cve-2026-55141-microsoft-office-excel-stack-based-buffer-overflow"},{"cve":"CVE-2026-55137","cvss":7.8,"slug":"cve-2026-55137-microsoft-office-excel-heap-buffer-overflow","title":"Microsoft Office Excel heap buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:20.583+00:00","url":"https://junglewise.ai/threats/cve-2026-55137-microsoft-office-excel-heap-buffer-overflow"},{"cve":"CVE-2026-55136","cvss":7.8,"slug":"cve-2026-55136-microsoft-excel-untrusted-pointer-dereference-remote-code","title":"Microsoft Excel untrusted pointer dereference remote code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:20.437+00:00","url":"https://junglewise.ai/threats/cve-2026-55136-microsoft-excel-untrusted-pointer-dereference-remote-code"},{"cve":"CVE-2026-55131","cvss":7.8,"slug":"cve-2026-55131-microsoft-excel-heap-buffer-overflow-code-execution","title":"Microsoft Excel heap buffer overflow code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:19.717+00:00","url":"https://junglewise.ai/threats/cve-2026-55131-microsoft-excel-heap-buffer-overflow-code-execution"},{"cve":"CVE-2026-55058","cvss":7.8,"slug":"cve-2026-55058-microsoft-excel-out-of-bounds-read-code-execution","title":"Microsoft Excel out-of-bounds read code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:18.087+00:00","url":"https://junglewise.ai/threats/cve-2026-55058-microsoft-excel-out-of-bounds-read-code-execution"},{"cve":"CVE-2026-55053","cvss":7.8,"slug":"cve-2026-55053-microsoft-excel-heap-buffer-overflow-code-execution","title":"Microsoft Excel heap buffer overflow code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:17.41+00:00","url":"https://junglewise.ai/threats/cve-2026-55053-microsoft-excel-heap-buffer-overflow-code-execution"},{"cve":"CVE-2026-55048","cvss":7.8,"slug":"cve-2026-55048-microsoft-excel-integer-overflow-local-code-execution","title":"Microsoft Excel integer overflow local code execution","severity":"high","exploited":false,"published_at":"2026-07-14T18:18:16.68+00:00","url":"https://junglewise.ai/threats/cve-2026-55048-microsoft-excel-integer-overflow-local-code-execution"}],"generated_at":"2026-09-26T09:24:00.138874+00:00"}