# XSS in Action View Advisory record · `GHSA-cfjv-5498-mph5` - **Identifiers:** `GHSA-cfjv-5498-mph5` · `CVE-2020-15169` - **State:** Confirmed - **Severity:** CVSS 5.4 Medium - **Critical:** No - **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) - **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) - **Published:** 11 Sept 2020 - **Updated:** 10 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 11 Sept 2020, 15:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `actionview` (RubyGems): affected `<5.2.4.4 || >=6.0.0.0, <6.0.3.3`; fixed in `5.2.4.4`, `6.0.3.3` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > The actionview RubyGems package, versions before 5.2.4.4 and from 6.0.0.0 before 6.0.3.3, has an XSS flaw in its translation helpers (\`t\` and \`translate\`). When a user-controlled default value is passed for a missing translation key named \`html\` or ending in \`\_html\`, it is marked HTML-safe and not escaped, so an attacker who can supply that value can inject script into the page. Upgrade to 5.2.4.4 or 6.0.3.3. If you cannot upgrade, escape default translation values manually with the html_escape helper. Written 8 Nov 2026. ## 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 - 5.4 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.024, the 83rd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 11 Sept 2020, 00:05 UTC: [Published by the maintainers as a GitHub repository advisory](https://github.com/rails/rails/security/advisories/GHSA-cfjv-5498-mph5) - 31 Oct 2026, 15:16 UTC: First seen by agentprime - 31 Oct 2026, 15:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-cfjv-5498-mph5) ## Sources - [GitHub Advisory Database: GHSA-cfjv-5498-mph5](https://github.com/advisories/GHSA-cfjv-5498-mph5) - [OSV: GHSA-cfjv-5498-mph5](https://osv.dev/vulnerability/GHSA-cfjv-5498-mph5) - - - - - - - - - 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 (), 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: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .