What is CVE-2026-73629?

CVE-2026-73629 is a high-severity vulnerability in S9y Serendipity, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-08-13.

How severe is CVE-2026-73629?

High severity. CVSS v3 base score is 8.5 out of 10.

SSRF in S9y Serendipity

CVE-2026-73629

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 adminImage…

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

S9y Serendipity — versions 0, 2.6.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-73629?: CVE-2026-73629 is a high-severity vulnerability in S9y Serendipity, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-08-13.
How severe is CVE-2026-73629?: High severity. CVSS v3 base score is 8.5 out of 10.