What is CVE-2026-13707?

CVE-2026-13707 is a high-severity vulnerability in MediaWiki, classified under Session Fixation. CVSS score: 7.6/10. Published 2026-07-01.

How severe is CVE-2026-13707?

High severity. CVSS v3 base score is 7.6 out of 10.

Vulnerability in MediaWiki

CVE-2026-13707

Session fixation vulnerability in Wikimedia Foundation OAuth. This vulnerability is associated with program files src/Backend/MWOAuthServer.Php. This issue affects OAuth: from * through 1.46.0, 1.45.4, 1.44.6, 1.43.9.

Published 2026-07-01 · last modified 2026-07-13.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.003 (25.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.5% 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: 0.003 · change: 0.000

Affected products

MediaWiki — versions 1.46.0
Wikimedia Foundation Oauth

Weakness classification (CWE)

CWE-384 — Session Fixation

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Permissions Required)

Frequently asked questions

What is CVE-2026-13707?: CVE-2026-13707 is a high-severity vulnerability in MediaWiki, classified under Session Fixation. CVSS score: 7.6/10. Published 2026-07-01.
How severe is CVE-2026-13707?: High severity. CVSS v3 base score is 7.6 out of 10.