CVE-2026-41921Medium· 5.4▾ Sunlit

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 throug…

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score30/ 100 · Low

impact 29.7 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Aug 18, 2026

Updated

Aug 21, 2026

CVSS

5.4

Vendor

—

Product

—

CWE

CWE-79

Depth score

30 · Low

EPSS

0.30% · p23

Platforms

—

Source

NVD

Vector

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

EPSS history

Exploit-prediction probability, daily snapshots since Aug 22.

0.3% → 0.3%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 4 days

Aug 18, 2026Published
Disclosed via NVD
Aug 21, 2026Record revised
Last analysed / modified upstream
Aug 22, 2026EPSS first tracked
0.3%

CWE-79 #nvd

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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