CVE-2025-32075Network attack vector

Visitor metadata disclosure via CSS injection

Published Apr 11, 2025 · Updated Apr 11, 2025

CSS injection in Wikimedia Foundation MediaWiki Tabs Extension 1.39 through 1.43 allows remote attackers to expose visitor metadata. The bgcolor attribute is inserted into generated CSS without constraining brace or URL syntax, allowing crafted wikitext to add attacker-controlled resource requests. A visitor must render a page containing the crafted tab markup; the outbound request reveals the visitor's IP address and user-agent string.

CVSS severity6.9
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSS injection in Wikimedia Foundation MediaWiki Tabs Extension 1.39 through 1.43 allows remote attackers to expose visitor metadata. The bgcolor attribute is inserted into generated CSS without constraining brace or URL syntax, allowing crafted wikitext to add attacker-controlled resource requests. A visitor must render a page containing the crafted tab markup; the outbound request reveals the visitor's IP address and user-agent string.

The record

CVE
CVE-2025-32075
Published
Apr 11, 2025
Updated
Apr 11, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki Tabs Extension
Classifications
CWE-20
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 11, 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=1.39 <=1.43

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · MediaWiki Tabs Extensionversion=1.39 <=1.43

Published CVSS scores

6.9Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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-20Improper Input Validation

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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