CVE-2026-26378 Cross-site scripting in n/a
Remote attackers can execute arbitrary code via XSS in Koha's invoice file upload feature, requiring an upgrade to secure the library system.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-26378?
CVE-2026-26378 is a medium-severity cross-site scripting vulnerability in n/a, published on 3 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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
Weakness: CWE-79
Which versions are affected by CVE-2026-26378?
It affects 1 product.
Products include Koha Koha.
How do I fix CVE-2026-26378?
No fix has been published for CVE-2026-26378 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-26378 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26378 exists.
Other vulnerabilities in n/a
Sources
Also known as GHSA-j9m8-fw2w-frcq.