Vendor
Synacor vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 37 vulnerabilities in Synacor: 0 in the last 7 days and 3 in the last 90 days, 20 of them critical and 19 exploited in the wild. The most recent, CVE-2026-66912, was published on 29 October 2026. 2 vulnerabilities in the last four weeks, up from none in the four before. 2 technologies have a page of their own.
- Last 7 days
- 0
- Last 90 days
- 3
- Critical, all time
- 20
- Exploited in the wild
- 19
About Synacor
Software company providing cloud-based platforms for communications, identity, and web services.
Synacor technologies
Latest Synacor vulnerabilities
- CVE-2026-66912: Zimbra Collaboration stored XSS in From header during reply compositioninfo
- CVE-2026-66911: Zimbra stored XSS via Content-Location MIME header in attachmentsinfo
- CVE-2026-73570: Zimbra Collaboration Suite OS command injection in SMTPcriticalexploited in the wildCVSS 9.8EPSS 11.7%
- CVE-2025-48700: Synacor Zimbra Collaboration Suite XSS in Classic UIcriticalexploited in the wildCVSS 6.1EPSS 18.8%
- CVE-2020-7796: Synacor Zimbra Collaboration Suite SSRF in WebEx zimletcriticalexploited in the wildCVSS 9.8EPSS 92.7%
- CVE-2025-66376: Synacor Zimbra Collaboration Suite stored XSS in Classic UIcriticalexploited in the wildCVSS 7.2EPSS 19.6%
- CVE-2025-68645: Synacor Zimbra Collaboration Suite file inclusion in RestFilter servletcriticalexploited in the wildCVSS 8.8EPSS 48.9%
- CVE-2025-27915: Synacor Zimbra Collaboration Suite XSS in Classic Web Clientcriticalexploited in the wildCVSS 5.4EPSS 26.1%
- CVE-2019-9621: Synacor Zimbra Collaboration Suite SSRF in ProxyServletcriticalexploited in the wildCVSS 7.5EPSS 94.1%
- CVE-2024-27443: Synacor Zimbra Collaboration Suite XSS in CalendarInvitecriticalexploited in the wildCVSS 6.1EPSS 32.4%
- CVE-2023-34192: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerabilitycriticalexploited in the wildCVSS 9
- CVE-2024-45519: Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2023-37580: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerabilitycriticalexploited in the wildCVSS 6.1
- CVE-2022-27926: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerabilitycriticalexploited in the wildCVSS 6.1
- CVE-2022-41352: Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2022-27925: Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerabilitycriticalexploited in the wildCVSS 7.2
- CVE-2022-37042: Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2022-27924: Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerabilitycriticalexploited in the wildCVSS 7.5
- CVE-2018-6882: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerabilitycriticalexploited in the wildCVSS 6.1
- CVE-2022-24682: Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerabilitycriticalexploited in the wildCVSS 6.1
- CVE-2019-9670: Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Referencecriticalexploited in the wildCVSS 9.8
- CVE-2016-4019: Zimbra Collaboration Suite integrity vulnerability via unknown vectorshighCVSS 7.5
- CVE-2016-3999: Zimbra Collaboration multiple XSS vulnerabilitiesmediumCVSS 6.1
- CVE-2016-3415: Zimbra Collaboration deserialization attack via unspecified vectorscriticalCVSS 9.1
- CVE-2016-3414: Zimbra Collaboration denial of service in mailboxdmediumCVSS 6.5
Most severe Synacor vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2020-7796: Synacor Zimbra Collaboration Suite SSRF in WebEx zimletcriticalexploited in the wildCVSS 9.8EPSS 92.7%
- CVE-2026-73570: Zimbra Collaboration Suite OS command injection in SMTPcriticalexploited in the wildCVSS 9.8EPSS 11.7%
- CVE-2024-45519: Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2022-41352: Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2022-37042: Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2019-9670: Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Referencecriticalexploited in the wildCVSS 9.8
- CVE-2023-34192: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerabilitycriticalexploited in the wildCVSS 9
- CVE-2025-68645: Synacor Zimbra Collaboration Suite file inclusion in RestFilter servletcriticalexploited in the wildCVSS 8.8EPSS 48.9%
- CVE-2019-9621: Synacor Zimbra Collaboration Suite SSRF in ProxyServletcriticalexploited in the wildCVSS 7.5EPSS 94.1%
- CVE-2022-27924: Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerabilitycriticalexploited in the wildCVSS 7.5
Vulnerabilities per week
2 vulnerabilities in the last four weeks, up from none in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 1 | 1 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 2 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Synacor vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/vendors/synacor)<a href="https://junglewise.ai/threats/vendors/synacor"><img src="https://junglewise.ai/threats/vendors/synacor/badge.svg" alt="Synacor vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/vendors/synacor.json, and this page as text at https://junglewise.ai/threats/vendors/synacor.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Synacor vulnerabilities", https://junglewise.ai/threats/vendors/synacor, 12 November 2026.