CVE-2021-25112: The WHMCS Bridge WordPress plugin before 6.4b does not sanitise and escape the error parameter before outputti

Q: How do I fix CVE-2021-25112?

whmcs bridge: upgrade to 6.4b. Exact commands for each OS are on this page.

Q: Is CVE-2021-25112 being exploited?

CVE-2021-25112 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-25112 affect?

CVE-2021-25112 affects whmcs bridge. Severity is medium (CVSS 6.1). 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

Q: How urgent is CVE-2021-25112?

Priority 47/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2021-25112 is a medium-severity flaw (CVSS 6.1) affecting whmcs bridge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-02-28
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: i-plugins

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-02-28 09:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

i-plugins whmcs bridge UPGRADE

Affected: < 6.4b

Fixed in: 6.4b

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy whmcs-bridge || rpm -q whmcs-bridge || whmcs-bridge --version

2. UPGRADE to 6.4b (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade whmcs-bridge

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade whmcs-bridge

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: WordPress WHMCS Bridge <6.4b - Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25112?

whmcs bridge: upgrade to 6.4b. Exact commands for each OS are on this page.

Is CVE-2021-25112 being exploited?

CVE-2021-25112 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25112 affect?

CVE-2021-25112 affects whmcs bridge. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2021-25112?

Priority 47/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2021-4074 MEDIUM 6.4 UPGRADE The WHMCS Bridge WordPress plugin is vulnerable to Stored Cross-Site Scripting via the cc_whmcs_bridge_url par

References

← Back to latest CVEs