CVE-2025-26951 - CVE House

Status published Medium CVE-2025-26951

WordPress C9 Blocks plugin <= 1.7.7 - Cross Site Scripting (XSS) vulnerability

6.5 CVSS

Vulnerability Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in covertnine C9 Blocks c9-blocks allows DOM-Based XSS.This issue affects C9 Blocks: from n/a through <= 1.7.7.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Gab | Patchstack Bug Bounty Program

References

https://patchstack.com/database/Wordpress/Plugin/c9-blocks/vulnerability/wordpress-c9-blocks-plugin-1-7-7-cross-site-scripting-xss-vulnerability?_s_id=cve

Affected Vendor

covertnine

View all reports →

Affected Software

C9 Blocks

Vulnerable Versions:

Timeline

Official Publish: April 15th, 2025

Last Modified: April 28th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise

Initial Access

T1059.007 JavaScript

Execution

T1539 Steal Web Session Cookie

Collection

T1213 Data from Information Repositories