Vulnerability · Published Aug 18, 2026 · Assigned by VulnCheck

CVE-2026-41921Koha Stored XSS via Purchase Suggestion Handler

Medium 5.4

In plain English

A medium-severity cross-site scripting in Koha from Koha Community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 77.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
Koha Community	Koha	26.05.0 – before 26.05.0225.11.0 – before 25.11.0725.05.0 – before 25.05.13

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

v26.05.02 Release Notes release-notes
v25.11.07 Release Notes release-notes
v25.05.13 Release Notes release-notes
https://www.vulncheck.com/advisories/koha-stored-xss-via-purchase-suggestion-handler third-party-advisory