CVE-2026-22710Public exploitNetwork attack vector

Stored XSS via parsed autocomment messages

Published Jan 8, 2026 · Updated Jan 8, 2026

Stored XSS in Wikimedia Foundation Wikibase 1.39, 1.43, 1.44, and 1.45 allows remote authenticated users to run script in viewers' browsers. Wikibase appends parsed system-message HTML to autocomments, after which CommentParser replaces wiki-link syntax inside an element attribute and creates executable unsafe HTML. A user with permission to edit MediaWiki interface messages must plant the payload, and a victim must view an affected history or recent-changes page.

CVSS severity2.3
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Wikimedia Foundation Wikibase 1.39, 1.43, 1.44, and 1.45 allows remote authenticated users to run script in viewers' browsers. Wikibase appends parsed system-message HTML to autocomments, after which CommentParser replaces wiki-link syntax inside an element attribute and creates executable unsafe HTML. A user with permission to edit MediaWiki interface messages must plant the payload, and a victim must view an affected history or recent-changes page.

The record

CVE
CVE-2026-22710
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
Wikimedia Foundation
Product
Wikibase
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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 privilegesadmin

What is affected?

Wikimedia Foundation · Wikibaseversion=1.39; version=1.43; version=1.44; version=1.45

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
2.3Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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