CVE-2025-53502Network attack vector

Script execution via unescaped i18n feed output

Published Jul 3, 2025 · Updated Jul 10, 2025

Cross-site scripting in Wikimedia Foundation FeaturedFeeds 1.39.x, 1.42.x, and 1.43.x allows remote attackers to inject HTML into feed output. The FeaturedFeedChannel action renders an internationalized interface message without HTML escaping, leaving embedded markup executable in generated feed responses. Exposure requires an enabled, configured featured-feed channel; successful injection can read or alter browser-accessible data in the wiki origin.

CVSS severity6.5
Medium
EPSS probability0.21%
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 FeaturedFeeds 1.39.x, 1.42.x, and 1.43.x allows remote attackers to inject HTML into feed output. The FeaturedFeedChannel action renders an internationalized interface message without HTML escaping, leaving embedded markup executable in generated feed responses. Exposure requires an enabled, configured featured-feed channel; successful injection can read or alter browser-accessible data in the wiki origin.

The record

CVE
CVE-2025-53502
Published
Jul 3, 2025
Updated
Jul 10, 2025
Vendor
Wikimedia Foundation
Product
FeaturedFeeds
Classifications
CWE-20, CAPEC-63, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 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.x
  2. Affected versionversion=1.42.x
  3. Affected versionversion=1.43.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · FeaturedFeedsversion=1.39.x; version=1.42.x; version=1.43.x

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

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
CAPEC-63Cross-Site Scripting (XSS)
T1059.007JavaScript/JScript

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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