XSS in Koha

CVE-2026-26377

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

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (29.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

  • Koha
  • N/a — versions n/a

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-26377?
CVE-2026-26377 is a medium-severity vulnerability in Koha, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-05.
How severe is CVE-2026-26377?
Medium severity. CVSS v3 base score is 5.4 out of 10.