CVE-2025-4579Network attack vector

Unauthenticated stored XSS via unescaped CSP reports

Published May 15, 2025 · Updated Apr 8, 2026

Stored XSS in WP Content Security Plugin 2.3 and earlier allows remote attackers to inject scripts through CSP report fields. The CSP reporting handler accepts blocked-uri and effective-directive values without sufficient sanitization and later emits the stored values without output escaping. No authentication is required to submit a crafted report, and the script executes in the browser whenever a user opens a page that renders the recorded violation.

CVSS severity7.2
High
EPSS probability0.36%
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 WP Content Security Plugin 2.3 and earlier allows remote attackers to inject scripts through CSP report fields. The CSP reporting handler accepts blocked-uri and effective-directive values without sufficient sanitization and later emits the stored values without output escaping. No authentication is required to submit a crafted report, and the script executes in the browser whenever a user opens a page that renders the recorded violation.

The record

CVE
CVE-2025-4579
Published
May 15, 2025
Updated
Apr 8, 2026
Vendor
Dylan Downhill
Product
WP Content Security Plugin
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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 <=2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dylan Downhill · WP Content Security Pluginversion=0 <=2.3

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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