CVE-2026-26379
Koha Z39.50 Arbitrary Code Execution
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.
INFO
Published Date :
June 3, 2026, 7:16 p.m.
Last Modified :
June 4, 2026, 6:54 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Koha to the latest version.
- Review and secure Z39.50 configuration.
- Apply vendor-supplied patches.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-26379.
| URL | Resource |
|---|---|
| https://g03m0n.github.io/ | Third Party Advisory |
| https://g03m0n.github.io/posts/cve-2026-26379/ | Exploit Third Party Advisory |
| https://github.com/Koha-Community/Koha | Product |
| https://g03m0n.github.io/posts/cve-2026-26379/ | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-26379 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-26379
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-26379 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-26379 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Reanalysis by [email protected]
Jun. 04, 2026
Action Type Old Value New Value Changed Reference Type MITRE: https://g03m0n.github.io/ Types: Exploit, Third Party Advisory MITRE: https://g03m0n.github.io/ Types: Third Party Advisory -
Initial Analysis by [email protected]
Jun. 04, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:koha:koha:*:*:*:*:*:*:*:* versions up to (including) 25.11.00 Added Reference Type MITRE: https://g03m0n.github.io/ Types: Exploit, Third Party Advisory Added Reference Type CISA-ADP: https://g03m0n.github.io/posts/cve-2026-26379/ Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://g03m0n.github.io/posts/cve-2026-26379/ Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://github.com/Koha-Community/Koha Types: Product -
CVE Modified by [email protected]
Jun. 04, 2026
Action Type Old Value New Value Changed Description An issue in Koha v.25.11 and before allows a remote attacker to execute arbitrary code via the Z39.50 configuration module 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. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 04, 2026
Action Type Old Value New Value Added CWE CWE-918 Removed CWE CWE-94 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 04, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Added CWE CWE-94 Added Reference https://g03m0n.github.io/posts/cve-2026-26379/ -
New CVE Received by [email protected]
Jun. 03, 2026
Action Type Old Value New Value Added Description An issue in Koha v.25.11 and before allows a remote attacker to execute arbitrary code via the Z39.50 configuration module Added Reference https://g03m0n.github.io/ Added Reference https://g03m0n.github.io/posts/cve-2026-26379/ Added Reference https://github.com/Koha-Community/Koha