How severe is CVE-2026-50766?

CVE-2026-50766 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-50766 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-50766?

CVE-2026-50766 affects Koha. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-50766?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-50766 published?

CVE-2026-50766 was published on 2026-06-26 and last updated on 2026-07-05.

CVE-2026-50766

CVE-2026-50766 is a medium-severity vulnerability in Koha with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Koha
Published: 2026-06-26
Last modified: 2026-07-05

Description

A stored cross-site scripting (XSS) vulnerability in the OPAC item detail page of Koha Library Management System 0 through 25.11 versions allow an authenticated remote attacker with edit_items permission to inject arbitrary web scripts via the item public notes field (items.itemnotes).

Frequently asked questions

What is CVE-2026-50766?: A stored cross-site scripting (XSS) vulnerability in the OPAC item detail page of Koha Library Management System 0 through 25.11 versions allow an authenticated remote attacker with edit_items permission to inject arbitrary web scripts via the item public notes field (items.itemnotes).
How severe is CVE-2026-50766?: CVE-2026-50766 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-50766 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-50766?: CVE-2026-50766 affects Koha. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-50766?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-50766 published?: CVE-2026-50766 was published on 2026-06-26 and last updated on 2026-07-05.

References

https://lgnas.gitbook.io/findings/cve-2026-50766

Affected products (1)

cpe:2.3:a:koha:koha:*:*:*:*:*:*:*:*

More vulnerabilities in Koha

CVE-2014-1925 — Critical (CVSS 9.8): SQL injection vulnerability in the MARC framework import/export function (admin/import_export_framework.pl) in Koha…
CVE-2014-1924 — Critical (CVSS 9.8): The MARC framework import/export function (admin/import_export_framework.pl) in Koha before 3.8.23, 3.10.x before…
CVE-2015-4633 — Critical (CVSS 9.8): Multiple SQL injection vulnerabilities in Koha 3.14.x before 3.14.16, 3.16.x before 3.16.12, 3.18.x before 3.18.08, and…
CVE-2024-28740 — Critical (CVSS 9.6): Cross Site Scripting vulnerability in Koha ILS 23.05 and before allows a remote attacker to execute arbitrary code via…
CVE-2026-31844 — High (CVSS 8.8): An authenticated SQL Injection vulnerability (CWE-89) exists in the Koha staff interface in the…
CVE-2018-1000669 — High (CVSS 8.8): KOHA Library System version 16.11.x (up until 16.11.13) and 17.05.x (up until 17.05.05) contains a Cross Site Request…

All CVEs affecting Koha →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →