CVE-2026-13707

Session fixation attacks on improperly configured OAuth 1.0a tools

HIGH

7.6

CVSS Score

Published: July 1, 2026 at 02:32 PM UTC

Updated: October 25, 2026 at 05:10 PM UTC

2 products affected across 2 vendorsMediaWikiMediaWiki

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Severity

HIGH7.6

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MediaWiki · Mediawiki

95%

1.43.0 ≤ v < 1.43.91.44.0 ≤ v < 1.44.61.45.0 ≤ v < 1.45.41.46.0 1.46.0 rc0

Affected range stops below 1.43.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.44.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.45.4, so it looks safe — our inference, not a vendor statement

MediaWiki · Wikimedia

90%

v ≤ 1.46.0, 1.45.4, 1.44.6, 1.43.9

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Permissions Required

Source: cverecord

https://phabricator.wikimedia.org/T428324

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.6HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: LOW

Vector?

Quick Info

StatusANALYZED

CWE

CWE-384

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