CVE-2025-62135Network attack vector

Stored XSS via unsanitized editor CSS injection

Published Dec 31, 2025 · Updated Dec 31, 2025

Stored XSS in Responsive Block Control 1.2.9 and earlier allows remote authenticated users to run script in an editor user's browser. The plugin's editor JavaScript injects a contributor-controlled customCss value into the page without adequate sanitization. Contributor access is required, and execution occurs when another user opens the affected block in the WordPress editor.

CVSS severity6.5
Medium
EPSS probability0.20%
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 Responsive Block Control 1.2.9 and earlier allows remote authenticated users to run script in an editor user's browser. The plugin's editor JavaScript injects a contributor-controlled customCss value into the page without adequate sanitization. Contributor access is required, and execution occurs when another user opens the affected block in the WordPress editor.

The record

CVE
CVE-2025-62135
Published
Dec 31, 2025
Updated
Dec 31, 2025
Vendor
Sascha Paukner
Product
Responsive Block Control
Classifications
CWE-79, CAPEC-588, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 31, 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=n/a <=1.2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sascha Paukner · Responsive Block Controlversion=n/a <=1.2.9

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-588DOM-Based XSS
T1059.007JavaScript/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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