CVE-2026-73629 json
Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses
published 3mo ago modified 18d ago also EUVD-2026-57798 , GHSA-2m48-gjj5-5x86
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository s9y/Serendipity. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 8.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
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.
Patch / fix
- s9y Serendipity 2.6.0
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- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 8.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- s9y Serendipity
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/s9y/Serendipity/security/advisories/GHSA-2m48-gjj5-5x86
vendor-advisory, advisory
-
vulncheck.com
/advisories/serendipity-before-ssrf-via-hex-ipv4-and-ipv6-addresses
third-party-advisory
Sources
- CVE List CVE-2026-73629
- NVD CVE-2026-73629
- Maintainer advisory GHSA-2m48-gjj5-5x86
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of s9y/Serendipity published their own advisory on GitHub. Reviewed sources take precedence over it.