CVE-2026-41921: Koha Community Koha

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Koha before 26.05.02, 25.11.07, and 25.05.13 contains a stored cross-site scripting vulnerability in the purchase suggestion handler that allows authenticated staff users to inject malicious scripts by submitting unsanitized input through the suggestion save operation. Attackers can supply crafted HTML or script content in fields such as title, author, isbn, publishercode, place, collectiontitle, itemtype, and note, which are stored without sanitization and later rendered in the suggestion list template, causing injected scripts to execute in the browser of any staff user who views the suggestions.

Affected products

• Koha Community Koha: from 26.05.0, before 26.05.02 (fixed in 26.05.02); from 25.11.0, before 25.11.07 (fixed in 25.11.07); from 25.05.0, before 25.05.13 (fixed in 25.05.13)

Published 2026-08-18. Last modified 2026-08-31.