CVE-2025-62697Network attack vector

Unauthenticated code injection via improperly sanitized style parameter

Published Oct 20, 2025 · Updated Oct 20, 2025

Code injection in Wikimedia Foundation LanguageSelector before 1.39 allows remote attackers to inject code through a crafted style parameter. The languageSelectorTag parser hook applies only CSS checking to the style attribute before passing it into a generated span style attribute. No authentication or user interaction is required; injected output can affect the rendered page and its downstream consumer, but no server-side execution path is published.

CVSS severity8.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Wikimedia Foundation LanguageSelector before 1.39 allows remote attackers to inject code through a crafted style parameter. The languageSelectorTag parser hook applies only CSS checking to the style attribute before passing it into a generated span style attribute. No authentication or user interaction is required; injected output can affect the rendered page and its downstream consumer, but no server-side execution path is published.

The record

CVE
CVE-2025-62697
Published
Oct 20, 2025
Updated
Oct 20, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki LanguageSelector Extension
Classifications
CWE-74, CAPEC-242
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 2025Record 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=master <1.39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · MediaWiki LanguageSelector Extensionversion=master <1.39

Published CVSS scores

8.8Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CAPEC-242Code Injection

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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