CVE-2026-26379 Server-side request forgery in n/a

Medium 6.5 Published 3 Jun 2026 Updated 4 Jun 2026

Authenticated attackers can exploit SSRF in Koha's Z39.50/SRU configuration to scan internal networks and identify running services.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-26379?

CVE-2026-26379 is a medium-severity server-side request forgery vulnerability in n/a, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Koha versions up to 25.11 contain a Server-Side Request Forgery (SSRF) vulnerability via the Z39.50/SRU server configuration. This allows authenticated attackers to perform internal network scanning and identify running services by analyzing server response times.

Weakness: CWE-918

Which versions are affected by CVE-2026-26379?

It affects 1 product.

Products include Koha Koha.

How do I fix CVE-2026-26379?

No fix has been published for CVE-2026-26379 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-26379 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26379 exists.

Sources

Also known as GHSA-7pjj-942q-wrwg.