TI-2021-02958 Aliases CVE-2021-4074 GHSA-25m8-2fq7-2r56

WHMCS Bridge <= 6.1 Subscriber+ Stored Cross-Site Scripting

LOW 29CWE-79Published 2022-01-18 · Updated 2025-02-14

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Cross-site scripting, Security bypass
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79 and CWE-862.

Summary

The WHMCS Bridge WordPress plugin is vulnerable to Stored Cross-Site Scripting via the cc_whmcs_bridge_url parameter found in the ~/whmcs-bridge/bridge_cp.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 6.1. Due to missing authorization checks on the cc_whmcs_bridge_add_admin function, low-level authenticated users such as subscribers can exploit this vulnerability.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00558 46th percentileScored 2026-11-08

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
WHMCS Bridge	WHMCS Bridge	6.1 – 6.1	—	No fix listed	CNA

WHMCS Bridge VendorWHMCS Bridge Affected 6.1 – 6.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:i-plugins:whmcs_bridge::::::wordpress::*	up to 6.1	Vulnerable	I-plugins

cpe:2.3:a:i-plugins:whmcs_bridge:*:*:*:*:*:wordpress:*:* Versions up to 6.1 Vulnerable ·I-plugins

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-4074
2026-10-03 Alias added: GHSA-25m8-2fq7-2r56

References

Patch 1

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2653041%40whmcs-bridge&new=2653041%40whmcs-bridge&sfp_email=&sfph_mail=

Advisory 1

https://www.wordfence.com/vulnerability-advisories/#CVE-2021-4074

TI-2021-07390 WHMCS Bridge < 6.4b - Reflected Cross-Site Scripting (XSS) CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences