CVE-2026-73629
Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses
- State
- Published
- Severity
- 8.4 High
- Published
- Aug 13, 2026
- Updated
- Aug 14, 2026
- Reserved
- Aug 13, 2026
Description
Serendipity before 2.6.0 contains a server-side request forgery vulnerability in the serendipity_url_allowed() filter that fails to block hex-encoded IPv4 addresses, IPv6 literals, and link-local ranges. Authenticated users with adminImagesAdd permission can bypass the filter using alternate address formats to request internal services and retrieve response bodies through the public uploads directory.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.4 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N | VulnCheck |
| 3.1 | 8.5 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N | VulnCheck |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
Serendipitys9y |
|
References
- GitHub Security Advisory (GHSA-2m48-gjj5-5x86)vendor-advisory
- VulnCheck Advisory: Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addressesthird-party-advisory
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