CVE-2026-22712Public exploitNetwork attack vector

CSS sanitizer bypass via late magic-word replacement

Published Jan 9, 2026 · Updated Jan 9, 2026

Improper output encoding in Wikimedia Approved Revs 1.39, 1.43, 1.44, and 1.45 allows remote attackers to bypass inline CSS sanitization. The ParserAfterTidy hook replaces the APPROVEDREVS magic word after strip markers are removed, transforming attacker-controlled style attributes into blocked CSS syntax. Exploitation requires a victim to render crafted wikitext and can trigger browser requests to attacker-chosen URLs, enabling input manipulation and limited disclosure.

CVSS severity2.3
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper output encoding in Wikimedia Approved Revs 1.39, 1.43, 1.44, and 1.45 allows remote attackers to bypass inline CSS sanitization. The ParserAfterTidy hook replaces the APPROVEDREVS magic word after strip markers are removed, transforming attacker-controlled style attributes into blocked CSS syntax. Exploitation requires a victim to render crafted wikitext and can trigger browser requests to attacker-chosen URLs, enabling input manipulation and limited disclosure.

The record

CVE
CVE-2026-22712
Published
Jan 9, 2026
Updated
Jan 9, 2026
Vendor
Wikimedia Foundation
Product
Approved Revs
Classifications
CWE-116, CAPEC-153, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.39
  2. Affected versionversion=1.43
  3. Affected versionversion=1.44
  4. Affected versionversion=1.45

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · Approved Revsversion=1.39; version=1.43; version=1.44; version=1.45

Published CVSS scores

2.3Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
4.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CAPEC-153Input Data Manipulation
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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