CVE-2026-41921: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Koha Community Koha
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.
AI Analysis
Technical Summary
Koha Community's Koha software versions >=25.05.0 <25.05.13, >=25.11.0 <25.11.07, and >=26.05.0 <26.05.02 contain a stored cross-site scripting vulnerability in the purchase suggestion handler. Authenticated staff users can submit crafted HTML or script content in multiple input fields (e.g., title, author, isbn) that are stored without proper sanitization. When these stored inputs are rendered in the suggestion list template, the malicious scripts execute in the browsers of staff users who view the suggestions, enabling potential XSS attacks.
Potential Impact
This vulnerability allows authenticated staff users to inject and store malicious scripts that execute in the browsers of other staff users viewing the purchase suggestion list. This can lead to unauthorized actions performed with the privileges of the victim user, data theft, or session hijacking. The CVSS score of 5.1 indicates a medium severity impact with network attack vector, low attack complexity, and no privileges required beyond authenticated staff access.
Mitigation Recommendations
A fix is available in Koha Community Koha versions 26.05.02, 25.11.07, and 25.05.13. Users should upgrade to these or later versions to remediate the vulnerability. Until patched, restrict staff user permissions to trusted individuals and avoid viewing untrusted purchase suggestions. Patch status is confirmed by the version ranges indicating fixed versions.
CVE-2026-41921: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Koha Community Koha
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.
CVSS v4.0
Score 5.1medium
Affected software
Koha Community
Koha
pkg:github/kohacommunity/KohaRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Koha Community's Koha software versions >=25.05.0 <25.05.13, >=25.11.0 <25.11.07, and >=26.05.0 <26.05.02 contain a stored cross-site scripting vulnerability in the purchase suggestion handler. Authenticated staff users can submit crafted HTML or script content in multiple input fields (e.g., title, author, isbn) that are stored without proper sanitization. When these stored inputs are rendered in the suggestion list template, the malicious scripts execute in the browsers of staff users who view the suggestions, enabling potential XSS attacks.
Potential Impact
This vulnerability allows authenticated staff users to inject and store malicious scripts that execute in the browsers of other staff users viewing the purchase suggestion list. This can lead to unauthorized actions performed with the privileges of the victim user, data theft, or session hijacking. The CVSS score of 5.1 indicates a medium severity impact with network attack vector, low attack complexity, and no privileges required beyond authenticated staff access.
Mitigation Recommendations
A fix is available in Koha Community Koha versions 26.05.02, 25.11.07, and 25.05.13. Users should upgrade to these or later versions to remediate the vulnerability. Until patched, restrict staff user permissions to trusted individuals and avoid viewing untrusted purchase suggestions. Patch status is confirmed by the version ranges indicating fixed versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-04-22T18:50:43.619Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a84ccacc6e8be0332c37667
Added to database: 08/18/2026, 21:20:44 UTC
Last enriched: 09/11/2026, 14:19:14 UTC
Last updated: 10/02/2026, 02:46:04 UTC
Views: 29
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