What is CVE-2026-58517?

CVE-2026-58517 is a medium-severity vulnerability in MediaWiki, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 4.3/10. Published 2026-07-01.

How severe is CVE-2026-58517?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in MediaWiki

CVE-2026-58517

Improper neutralization of input terminators vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension allows Authentication Bypass. This issue affects Mediawiki - WikiLambda Extension: from * before 1.43.9,1.44.6,1.45.4.

EPSS: 0.002 (9.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

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

Frequently asked questions

What is CVE-2026-58517?: CVE-2026-58517 is a medium-severity vulnerability in MediaWiki, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 4.3/10. Published 2026-07-01.
How severe is CVE-2026-58517?: Medium severity. CVSS v3 base score is 4.3 out of 10.