# s9y/serendipity (Packagist) vulnerabilities

2 known vulnerabilities (1 high, 1 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://packagist.org/packages/s9y/serendipity

## Advisories (2)

### [CVE-2026-39971](https://cve.now/CVE-2026-39971): Serendipity: Host Header Injection leads to SMTP header injection via unvalidated HTTP\_HOST

- Severity: High 7.2
- Published: Apr 14, 2026
- Affected: fixed in 2.6.0.

### [CVE-2026-39963](https://cve.now/CVE-2026-39963): Serendipity: Host Header Injection enables authentication cookie scoping to an attacker-controlled domain

- Severity: Medium 6.9
- Published: Apr 14, 2026
- Affected: fixed in 2.6.0.

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