# Loofah has improper detection of disallowed URIs via \`allowed_uri?\`

Advisory record · `GHSA-2j22-pr5w-6gq8`

- **Identifiers:** `GHSA-2j22-pr5w-6gq8`
- **State:** Confirmed
- **Severity:** CVSS 4.0, no score published
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-116](https://cwe.mitre.org/data/definitions/116.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [CWE-116](https://agentprime.io/advisories/tag/cwe-116.md)
- **Published:** 26 Mar 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 Mar 2026, 22:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `loofah` (RubyGems): affected `>=2.25.0, <2.25.1`; fixed in `2.25.1`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- Score not published, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 31 Oct 2026, 15:16 UTC: First seen by agentprime
- 31 Oct 2026, 15:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2j22-pr5w-6gq8)

## Sources

- [GitHub Advisory Database: GHSA-2j22-pr5w-6gq8](https://github.com/advisories/GHSA-2j22-pr5w-6gq8)
- [OSV: GHSA-2j22-pr5w-6gq8](https://osv.dev/vulnerability/GHSA-2j22-pr5w-6gq8)
- <https://github.com/flavorjones/loofah/security/advisories/GHSA-46fp-8f5p-pf2m>
- <https://github.com/flavorjones/loofah/commit/f4ebc9c5193dde759a57541062e490e86fc7c068>
- <https://github.com/flavorjones/loofah>
- <https://github.com/flavorjones/loofah/releases/tag/v2.25.1>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/loofah/GHSA-46fp-8f5p-pf2m.yml>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-2j22-pr5w-6gq8>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-2j22-pr5w-6gq8/>. Everything for agents: <https://agentprime.io/llms.txt>.