CVE-2024-47845

CSS sanitizer used incorrectly, and is easily bypassed

HIGH

8.2

CVSS Score

Published: October 5, 2024 at 12:09 AM UTC

Updated: June 17, 2026 at 07:57 AM UTC

1 product affected across 1 vendorWikimedia Extensions Css

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Severity

HIGH8.2

Exploit prediction

EPSS 0.4%

SSVC

PoC

Description

Improper Encoding or Escaping of Output vulnerability in The Wikimedia Foundation Mediawiki - CSS Extension allows Code Injection.This issue affects Mediawiki - CSS Extension: from 1.39.X before 1.39.9, from 1.41.X before 1.41.3, from 1.42.X before 1.42.2.

Affected

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

Wikimedia Extensions Css · Wikimedia

95%

1.39.0 ≤ v < 1.39.91.39.x ≤ v < 1.39.91.41.0 ≤ v < 1.41.31.41.x ≤ v < 1.41.31.42.0 ≤ v < 1.42.21.42.x ≤ v < 1.42.21.39.0 1.39.x 1.41.0 1.41.x 1.42.0 1.42.x

Affected range stops below 1.39.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.41.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.42.2, 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

References (3)

Patch

Source: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

https://gerrit.wikimedia.org/r/q/I6f38f4a8fc1dcd690ab27b8f18ce6ca903bacc53

ExploitIssue TrackingVendor Advisory

Source: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

https://phabricator.wikimedia.org/T368594

Issue TrackingVendor Advisory

Source: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

https://phabricator.wikimedia.org/T368628

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

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

CVSS

8.2HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: HIGH
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-116

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