What is CVE-2026-34089?

CVE-2026-34089 is a high-severity vulnerability in Wikimedia Scribunto, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2026-05-11.

How severe is CVE-2026-34089?

High severity. CVSS v3 base score is 7.5 out of 10.

XSS in Wikimedia Scribunto

CVE-2026-34089

Vulnerability in Wikimedia Foundation Scribunto. This issue affects Scribunto: from 1.45.0 before 1.45.2.

Published 2026-05-11 · last modified 2026-08-11.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Wikimedia Scribunto
Wikimedia Foundation Scribunto — versions 1.45.0

Weakness classification (CWE)

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34089?: CVE-2026-34089 is a high-severity vulnerability in Wikimedia Scribunto, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2026-05-11.
How severe is CVE-2026-34089?: High severity. CVSS v3 base score is 7.5 out of 10.