CVE-2026-126079: rails · Cross-site Scripting
Affects railsSource CVE Database V5
Not known to be exploited · CVSS 6.1 Medium : upgrade to 8.1.4.1 or 8.0.5.2 when convenient.
Data as of 10 Nov 2026, 21:20 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 6.1 |
|---|
- Patch
- Available – fixed in 8.1.4.1, 8.0.5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.
What to do
Upgrade rails to 8.1.4.1 or 8.0.5.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| railsrails | Affected
| Fixed in
|
| railsrails | Affected
| Fixed in
|
AI-suggested
Upgrade Rails to version 8.0.5.2 or later, or 8.1.4.1 or later, where this vulnerability is fixed. No other mitigation is indicated or required by the vendor advisory.
Description
A cross-site scripting (XSS) vulnerability exists in the Rails Action View framework's HTML5 sanitizer when used with certain text helpers (highlight and simple_format). This occurs because Nokogiri versions before 1.19.5 serialize < and > characters unescaped inside attribute values, which can cause sanitized inert markup to be rendered as live HTML elements. The issue affects Rails versions prior to 8.0.5.2 and between 8.1 and before 8.1.4.1. The vulnerability is fixed in versions 8.0.5.2 and 8.1.4.1.
References
- github.com/rails/rails/security/advisories/GHSA-2p2f-4rq4-gjwc (opens in a new tab)
- github.com/rails/rails/commit/009ea68342d05d02087c04dae7faaa4e4c1def11 (opens in a new tab)
- github.com/rails/rails/releases/tag/v8.0.5.2 (opens in a new tab)
- github.com/rails/rails/releases/tag/v8.1.4.1 (opens in a new tab)
- github.com/rails/rails/commit/adc3a32d4abea77ed3aacf6f5fb71cfc005bef73 (opens in a new tab)