CVE-2021-25112: WHMCS Bridge < 6.4b - Reflected Cross-Site Scripting (XSS)

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-02-28 · updated 2026-06-17
Weakness: CWE-79

Description

The WHMCS Bridge WordPress plugin before 6.4b does not sanitise and escape the error parameter before outputting it back in admin dashboard, leading to a Reflected Cross-Site Scripting

Affected products

WHMCS Bridge: before 6.4b — fixed in 6.4b

How to fix

Upgrade to a fixed version: WHMCS Bridge 6.4b. Check the vendor advisory for mitigations.

References

https://plugins.trac.wordpress.org/changeset/2659751
https://wpscan.com/vulnerability/4aae2dd9-8d51-4633-91bc-ddb53ca3471c
https://plugins.trac.wordpress.org/changeset/2659751
https://wpscan.com/vulnerability/4aae2dd9-8d51-4633-91bc-ddb53ca3471c

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