What is CVE-2026-34087?

CVE-2026-34087 is a high-severity vulnerability in Mediawiki, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-05-11.

How severe is CVE-2026-34087?

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

Information disclosure in Mediawiki

CVE-2026-34087

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation OATHAuth. This issue affects OATHAuth: from * before 1.43.7, 1.44.4, 1.45.2.

Vulnerability class: Information Disclosure

EPSS: 0.000 (13.6th percentile) — read the EPSS interpretation.

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:H/I:N/A:N.

Affected products

Mediawiki
Wikimedia Foundation Oathauth

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

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

Frequently asked questions

What is CVE-2026-34087?: CVE-2026-34087 is a high-severity vulnerability in Mediawiki, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-05-11.
How severe is CVE-2026-34087?: High severity. CVSS v3 base score is 7.5 out of 10.