CVE-2026-58517

Blocked users can create and edit WikiLambda objects

MEDIUM

4.3

CVSS Score

Published: July 1, 2026 at 06:23 PM UTC

Updated: October 25, 2026 at 04:10 PM UTC

2 products affected across 2 vendorsMediaWikiWikiLambda

Using Mediawiki - WikiLambda Extension by The Wikimedia Foundation?

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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.

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 < 1.45.4

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

WikiLambda · Wikimedia

90%

v < 1.43.9,1.44.6,1.45.4

Affected range stops below 1.43.9,1.44.6,1.45.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://phabricator.wikimedia.org/T428833

References (2)

Issue TrackingVendor Advisory

Source: cverecord

https://phabricator.wikimedia.org/T428833

Issue Tracking

Source: cverecord

https://gerrit.wikimedia.org/r/c/1305376

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

4.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-288

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