What is the CVSS score of CVE-2026-26377?

CVE-2026-26377 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.1%.

Which versions of Koha are affected by CVE-2026-26377?

Organizations using Koha 25.11 and should be aware of moderate risk from CVE-2026-26377, a cross-site scripting vulnerability rated CVSS 5.4.

Is there a public PoC exploit available for CVE-2026-26377?

Yes, a public proof-of-concept exploit is available for CVE-2026-26377. Prioritise patching immediately. EPSS: 0.1%.

Koha CVE-2026-26377

MEDIUM

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

2026-03-05 cve@mitre.org

XSS Koha

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

PoC Detected

Mar 10, 2026 - 18:18 vuln.today

Public exploit code

CVE Published

Mar 05, 2026 - 16:16 nvd

MEDIUM 5.4

DescriptionCVE.org

Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code via the News function.

AnalysisAI

Koha versions 25.11 and earlier contain a stored cross-site scripting vulnerability in the News function that allows authenticated users to inject malicious scripts affecting other users who view the compromised content. Public exploit code exists for this vulnerability, and attackers can leverage it to steal session data or perform actions on behalf of victims. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.4 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running Koha 25.11 and and apply vendor patches as part of regular patch cycle. …

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CVE-2026-26377 vulnerability details – vuln.today

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