CVE-2023-2433Network attack vector

Stored script execution via unescaped className output

Published Jul 18, 2023 · Updated Apr 8, 2026

Stored XSS in YARPP 5.30.3 and earlier allows remote authenticated users to inject scripts through the className parameter. The rendering path in classes/YARPP_Core.php places the attacker-controlled className value into page output without sufficient sanitization or escaping. Contributor-level access is sufficient, and the stored script executes in a visitor's browser when the injected page is opened.

CVSS severity5.4
Medium
EPSS probability0.51%
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 YARPP 5.30.3 and earlier allows remote authenticated users to inject scripts through the className parameter. The rendering path in classes/YARPP_Core.php places the attacker-controlled className value into page output without sufficient sanitization or escaping. Contributor-level access is sufficient, and the stored script executes in a visitor's browser when the injected page is opened.

The record

CVE
CVE-2023-2433
Published
Jul 18, 2023
Updated
Apr 8, 2026
Vendor
Jeff Parker
Product
YARPP – Yet Another Related Posts Plugin
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 18, 2023CVE 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 <=5.30.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jeff Parker · YARPP – Yet Another Related Posts Pluginversion=0 <=5.30.3

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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
Privilegesauthenticated
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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