CVE-2026-26378

Name: CVE-2026-26378
Creator: NVD / NIST
Published: 2026-06-03T19:16:25.4+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2026-26378 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code via file upload function in Invoice features. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code via file upload function in Invoice features

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.30%

21.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Koha	Koha	<= 25.11.00

References

https://g03m0n.github.ioThird Party Advisory
https://g03m0n.github.io/posts/cve-2026-26378/Exploit, Third Party Advisory
https://github.com/Koha-Community/KohaProduct
https://g03m0n.github.io/posts/cve-2026-26378/Exploit, Third Party Advisory

Timeline

Published: Jun 3, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-26378?

Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code via file upload function in Invoice features

How severe is CVE-2026-26378?

CVE-2026-26378 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2026-26378?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-26378?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST