Skip to main content
VulnerabilityPublished

CVE-2026-126079: rails · Cross-site Scripting

Affects railsSource CVE Database V5

0
Compare

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

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.16.1
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
railsrailsAffected
  • >=8.1 <8.1.4.1
Fixed in
  • 8.1.4.1
railsrailsAffected
  • <8.0.5.2
Fixed in
  • 8.0.5.2

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

Community reviews

Loading reviews…