CVE-2026-73629
8.4
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| s9y | Serendipity | 0 < 2.6.0 | affected |
| s9y | Serendipity | 2.6.0 | unaffected |
Weaknesses
- CWE-918: Server-Side Request Forgery (SSRF)
References
- https://github.com/s9y/Serendipity/security/advisories/GHSA-2m48-gjj5-5x86
- https://www.vulncheck.com/advisories/serendipity-before-ssrf-via-hex-ipv4-and-ipv6-addresses
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