Koha Stored XSS via Purchase Suggestion Handler

Answer in brief

CVE-2026-41921 records a Medium severity (CVSS 5.4) vulnerability in Koha Stored XSS via Purchase Suggestion Handler. The current sources do not mark it as known exploited. The current feed maps Koha Community/Koha (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 18, 2026Updated Aug 18, 2026Source checked Aug 20, 2026First seen by HOL Aug 18, 2026Material review Aug 18, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.4
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Koha Community/Koha (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Koha Community/Kohageneric	>=26.05.0 <26.05.02 \|\| >=25.11.0 <25.11.07 \|\| >=25.05.0 <25.05.13	26.05.02, 25.11.07, 25.05.13

Recommended response

Check inventory. Check lockfiles and deployed manifests for Koha Community/Koha.
Review the reported fix. Update Koha Community/Koha to 26.05.02 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 18, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.