# S9y Serendipity vulnerabilities

Source: https://junglewise.ai/threats/technologies/s9y-serendipity-1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/s9y-serendipity-1.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in S9y Serendipity: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-39971, was published on 15 April 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 3 (0 critical, 0 exploited in the wild)

## About S9y Serendipity

Lightweight PHP-based content management and blogging engine.

## Latest S9y Serendipity vulnerabilities

- [CVE-2026-39971: Serendipity has a Host Header Injection allows SMTP header injection via unvalidated HTTP_HOST in Message-ID email header](https://junglewise.ai/threats/cve-2026-39971-serendipity-has-a-host-header-injection-allows-smtp-header) (high, CVSS 7.2, published 15 Apr 2026)
- [CVE-2026-39963: Serendipity Host Header Injection in serendipity_setCookie](https://junglewise.ai/threats/cve-2026-39963-serendipity-host-header-injection-in-serendipity-setcookie) (medium, CVSS 6.9, published 15 Apr 2026)
- [CVE-2024-58282: Serendipity 2.5.0 contains a remote code execution vulnerability that allows authenticated administrators to upload…](https://junglewise.ai/threats/cve-2024-58282-serendipity-2-5-0-contains-a-remote-code-execution-vulnerability) (high, CVSS 7.2, published 10 Dec 2025)

## Most severe S9y Serendipity vulnerabilities

- [CVE-2024-58282: Serendipity 2.5.0 contains a remote code execution vulnerability that allows authenticated administrators to upload…](https://junglewise.ai/threats/cve-2024-58282-serendipity-2-5-0-contains-a-remote-code-execution-vulnerability) (high, CVSS 7.2, published 10 Dec 2025)
- [CVE-2026-39971: Serendipity has a Host Header Injection allows SMTP header injection via unvalidated HTTP_HOST in Message-ID email header](https://junglewise.ai/threats/cve-2026-39971-serendipity-has-a-host-header-injection-allows-smtp-header) (high, CVSS 7.2, published 15 Apr 2026)
- [CVE-2026-39963: Serendipity Host Header Injection in serendipity_setCookie](https://junglewise.ai/threats/cve-2026-39963-serendipity-host-header-injection-in-serendipity-setcookie) (medium, CVSS 6.9, published 15 Apr 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "S9y Serendipity vulnerabilities", https://junglewise.ai/threats/technologies/s9y-serendipity-1, 9 November 2026.