Is WHMCS Bridge safe to use?

Laskyr does not give safety verdicts. WHMCS Bridge is closed on wordpress.org. Closed on 2026-07-06 (reason given: Security Issue). Closed plugins get no updates through WordPress, so new security holes will not be fixed for you. Keep WHMCS Bridge on the latest version and remove it if you do not use it.

Which versions of WHMCS Bridge are vulnerable?

Known issues on record (newest first): Arbitrary file upload (6.9 and older); Reflected cross-site scripting (XSS) (older than 6.4b, fixed in 6.4b); Stored cross-site scripting (XSS) (6.1 to 6.1). The full list with sources is on this page.

What should I do if my WHMCS Bridge is out of date?

Take a backup, then update it from Dashboard > Updates (or run wp plugin update whmcs-bridge). If you cannot update right away, deactivate it until you can. If you think the site was already attacked, run a free scan at https://laskyr.com/scan.

Plugins · whmcs-bridge · data as of 2026-11-04

Is WHMCS Bridge safe? Known vulnerabilities and latest version

Status: Closed 2026-07-06
Known issues on record: 3
Unpatched in latest: 0

What to do

Replace it. A closed plugin gets no updates through WordPress, so any hole found from now on stays open.
Deactivate and delete it once you have a replacement (Plugins → Deactivate → Delete). Deleting removes its files; deactivating alone leaves them on the server.
If you ran a vulnerable version and something looks off (spam pages, strange admins, redirects), run the free scan, or have us clean it: Emergency Cleanup, $499.

With WP-CLI, once you have a replacement: wp plugin deactivate whmcs-bridge && wp plugin delete whmcs-bridge

Check your version

Known vulnerabilities

3 on record, newest first. “Affected” is the version range the source gives; “fixed in” is the version the source names, or (marked *) the first wordpress.org release after the last affected version. 3 record(s) do not state which versions are affected.

high 8.8 CVE-2026-14489 · published 2026-07-08

Arbitrary file upload in WHMCS Bridge (6.9 and older)

Affected: 6.9 and older
Fixed in: unknown
Access needed (per CVSS): Needs a low-level account (e.g. subscriber)
Range from: CVE record (the advisory publisher) · score by Wordfence

Details from the advisory

The WHMCS Bridge plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the connect() function in all versions up to, and including, 6.9. This makes it possible for authenticated attackers, with Custom-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.

NVD CVE-2026-14489 Wordfence advisory Plugin source

medium 6.1 CVE-2021-25112 · published 2022-02-28

Reflected cross-site scripting (XSS) in WHMCS Bridge (older than 6.4b)

Affected: older than 6.4b
Fixed in: 6.4b
Access needed (per CVSS): No login needed; someone on the site has to click a link or open a page
Range from: NVD analysis · score by NVD

Details from the advisory

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

NVD CVE-2021-25112 WPScan advisory Code change (fix)

medium 5.4 CVE-2021-4074 · published 2022-01-18

Stored cross-site scripting (XSS) in WHMCS Bridge (6.1 to 6.1)

Affected: 6.1 to 6.1
Fixed in: unknown
Access needed (per CVSS): Needs a low-level account (e.g. subscriber); someone on the site has to click a link or open a page
Range from: CVE record (the advisory publisher) · score by NVD

Details from the advisory

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.

NVD CVE-2021-4074 Code change (fix)Wordfence advisory

Recent activity

2026-07-06 — closed on wordpress.org (Security Issue).
2026-07-08 — Arbitrary file upload disclosed (CVE-2026-14489), fix version not stated.
2022-02-28 — Reflected cross-site scripting (XSS) disclosed (CVE-2021-25112), fixed in 6.4b.
2022-01-18 — Stored cross-site scripting (XSS) disclosed (CVE-2021-4074), fix version not stated.

Free. We check the CVE feeds every day and email you only when a new issue for WHMCS Bridge (whmcs-bridge) is published or a fix ships. Unsubscribe in one click.

Browse vulnerabilities

Types found in this plugin: Cross-site scripting (XSS) (2) · Arbitrary file upload (1)

Where this data comes from

Version, last update, installs, closure: wordpress.org/plugins/whmcs-bridge (Plugins API), fetched 2026-11-04.
Vulnerabilities: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Each record links to its CVE page and to the original advisory (Wordfence, Patchstack or WPScan) where there is one. We only list a CVE here when its references or its advisory name this exact plugin, so a few real issues may be missing; none should be about a different plugin. Spot an error? Email Daniel.

Badge for your site or docs (states facts with a date, not a verdict):

<a href="https://laskyr.com/plugins/whmcs-bridge"><img src="https://laskyr.com/plugins/whmcs-bridge/badge.svg" alt="WHMCS Bridge vulnerability status"></a>

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Is WHMCS Bridge safe? Known vulnerabilities and latest version

WHMCS Bridge is closed on wordpress.org

What to do

Check your version

Known vulnerabilities

Arbitrary file upload in WHMCS Bridge (6.9 and older)

Reflected cross-site scripting (XSS) in WHMCS Bridge (older than 6.4b)

Stored cross-site scripting (XSS) in WHMCS Bridge (6.1 to 6.1)

Recent activity

Get an email when WHMCS Bridge has a new vulnerability

Browse vulnerabilities

Where this data comes from