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.
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 | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.4 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N | 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
- 31 Oct 2026, 15:16 UTC First seen by agentprime
- 31 Oct 2026, 15:16 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-cfjv-5498-mph5
- OSV: GHSA-cfjv-5498-mph5
- github.com/rails/rails/security/advisories/GHSA-cfjv-5498-mph5
- nvd.nist.gov/vuln/detail/CVE-2020-15169
- github.com/rails/rails/commit/e663f084460ea56c55c3dc76f78c7caeddeeb02e
- github.com/rails/rails
- github.com/rubysec/ruby-advisory-db/blob/master/gems/actionview/CVE-2020-15169.yml
- groups.google.com/g/rubyonrails-security/c/b-C9kSGXYrc
- lists.debian.org/debian-lts-announce/2020/10/msg00015.html
- lists.fedoraproject.org/archives/list/[email protected]/message/XJ7NUWXAEVRQCROIIBV4C6WXO6IR3KSB
- www.debian.org/security/2020/dsa-4766