CVE-2025-5923Network attack vector

Stored XSS via unescaped className attribute

Published Jun 13, 2025 · Updated Apr 8, 2026

Stored XSS in Marc Tönsing Game Review Block 4.8.1 and earlier allows remote authenticated users to inject scripts via className. The render_game_table function applies strip_tags to className, then places the derived value in a table class attribute without attribute escaping. Contributor-level access is sufficient, and injected scripts execute whenever a user visits the affected page.

CVSS severity6.4
Medium
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

Stored XSS in Marc Tönsing Game Review Block 4.8.1 and earlier allows remote authenticated users to inject scripts via className. The render_game_table function applies strip_tags to className, then places the derived value in a table class attribute without attribute escaping. Contributor-level access is sufficient, and injected scripts execute whenever a user visits the affected page.

The record

CVE
CVE-2025-5923
Published
Jun 13, 2025
Updated
Apr 8, 2026
Vendor
Marc Tönsing
Product
Game Review Block
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 13, 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 <=4.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Marc Tönsing · Game Review Blockversion=0 <=4.8.1

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/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.

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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.

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Technologies

Your stack

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Your stack

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