CVE-2025-4955Public exploitNetwork attack vector

Stored XSS via unsanitized YouTube oEmbed parameters

Published Jun 18, 2025 · Updated Jun 18, 2025

Stored XSS in the tarteaucitron.io WordPress plugin before 1.9.5 allows remote authenticated users to run script through YouTube oEmbed URLs. The oEmbed handler places unsanitized query parameters from a crafted YouTube playlist URL into rendered post content, where an injected event handler executes. Contributor-level access is required to save the crafted embed; the script runs when the stored post is displayed and acts in the viewer's browser context.

CVSS severity4.7
Medium
EPSS probability0.35%
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 the tarteaucitron.io WordPress plugin before 1.9.5 allows remote authenticated users to run script through YouTube oEmbed URLs. The oEmbed handler places unsanitized query parameters from a crafted YouTube playlist URL into rendered post content, where an injected event handler executes. Contributor-level access is required to save the crafted embed; the script runs when the stored post is displayed and acts in the viewer's browser context.

The record

CVE
CVE-2025-4955
Published
Jun 18, 2025
Updated
Jun 18, 2025
Vendor
Amauri Champeaux
Product
tarteaucitron.io
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 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=0 <1.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Amauri Champeaux · tarteaucitron.ioversion=0 <1.9.5

Published CVSS scores

4.7CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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