CVE-2025-62659Network attack vector

Cross-site scripting via unsafe iframe source promotion

Published Oct 22, 2025 · Updated Oct 22, 2025

Cross-site scripting in Wikimedia Foundation MediaWiki CookieConsent extension before 2.0.0 allows remote authenticated users to run script. Client code copies the allowed data-src value from a matching iframe into its executable src attribute without URL-scheme validation. Exploitation requires another tag extension to emit an iframe from attacker-controlled wikitext attributes and a visitor to grant the relevant cookie consent, enabling script execution in that visitor's browser.

CVSS severity2.1
Low
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Wikimedia Foundation MediaWiki CookieConsent extension before 2.0.0 allows remote authenticated users to run script. Client code copies the allowed data-src value from a matching iframe into its executable src attribute without URL-scheme validation. Exploitation requires another tag extension to emit an iframe from attacker-controlled wikitext attributes and a visitor to grant the relevant cookie consent, enabling script execution in that visitor's browser.

The record

CVE
CVE-2025-62659
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki CookieConsent extension
Classifications
CWE-79, CAPEC-63, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=v0.1.0 <v2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wikimedia Foundation · MediaWiki CookieConsent extensionversion=v0.1.0 <v2.0.0

Published CVSS scores

2.1Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63Cross-Site Scripting (XSS)
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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