EUVD-2026-39940
GHSA-wh28-gg5r-p54p
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Description explicitly requires administrator privileges (PR:H); victim must visit the poisoned admin page (UI:R); XSS payload executes in a different user's browser, constituting scope change (S:C).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Cross-Site Scripting (XSS) vulnerability in the patron restriction type administration page of Koha Library Management System through 25.11 allows an authenticated remote attacker with administrator privileges to inject arbitrary web scripts via the restriction type label (display_text field)
AnalysisAI
Stored Cross-Site Scripting in Koha Library Management System through version 25.11 allows an authenticated administrator to inject persistent JavaScript into the patron restriction type administration page via the display_text (restriction type label) field. When another privileged user subsequently navigates to that administration page, the stored payload executes in their browser, enabling session hijacking, credential theft, or further administrative compromise. No public KEV listing exists, but SSVC data confirms a proof-of-concept exploit is available; EPSS at 0.21% (12th percentile) reflects the low broad exploitation probability consistent with a niche product and high privilege prerequisite.
Technical ContextAI
Koha is an open-source Integrated Library System (ILS) used primarily by public, academic, and school libraries, with its administrative interface built on Perl and web technologies. CWE-79 (Improper Neutralization of Input During Web Page Generation) is the root cause: the display_text field in the patron restriction type administration page accepts free-form text that is subsequently rendered back into HTML without adequate sanitization or output encoding. This is a stored (persistent) XSS pattern - the payload is written to the Koha database and replayed to every privileged user who loads the administration view, amplifying impact beyond a single-victim reflected XSS. No vendor-assigned CPE is available in the source data (listed as n/a), but the vulnerability is scoped to the administrative web interface of Koha releases through 25.11.
RemediationAI
No specific patched version has been identified in the available data at time of analysis - administrators should consult the Koha vendor directly at http://koha.com and monitor the NVD advisory at https://nvd.nist.gov/vuln/detail/CVE-2026-50765 for an official fix. As a compensating control, restrict write access to the patron restriction type administration interface to the absolute minimum number of trusted, individually-accountable administrator accounts, eliminating shared or broadly-assigned admin credentials to reduce the attacker pool. Implementing a restrictive Content Security Policy (CSP) header (e.g., script-src 'self') on the Koha administrative interface can block inline script execution and materially reduce XSS exploitability, though this should be tested against Koha's legitimate JavaScript dependencies to avoid breaking functionality. Output encoding of the display_text field at the rendering layer is the correct permanent fix and should be validated in any vendor patch.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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