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CVE-2026-33167

CVE-2026-33167 · Rails has a possible XSS vulnerability in its Action Pack debug exceptions

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.

CVSS 1.3 · Low · EPSS 0.3%

Published
Updated

Stack: system

Affected products and versions

  • actionpack

    Versions
    • >= 8.1.0, < 8.1.2.1: Affected

    No fix published

  • rails Ubuntu:Pro:16.04:LTS

    Versions
    • 2:4.1.10-1
    • 2:4.2.5-1
    • 2:4.2.5.1-1
    • 2:4.2.5.2-2
    • 2:4.2.6-1
    • 2:4.2.6-1ubuntu0.1~esm1
    • 2:4.2.6-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:Pro:18.04:LTS

    Versions
    • 2:4.2.9-2
    • 2:4.2.9-4
    • 2:4.2.10-0ubuntu4
    • 2:4.2.10-0ubuntu4+esm1
    • 2:4.2.10-0ubuntu4+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:Pro:20.04:LTS

    Versions
    • 2:5.2.2.1+dfsg-1ubuntu1
    • 2:5.2.3+dfsg-3
    • 2:5.2.3+dfsg-3ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:Pro:22.04:LTS

    Versions
    • 2:6.0.3.7+dfsg-2
    • 2:6.1.4.1+dfsg-8ubuntu2
    • 2:6.1.4.1+dfsg-8ubuntu2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:24.04:LTS

    Versions
    • 2:6.1.7.3+dfsg-2build1
    • 2:6.1.7.3+dfsg-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:25.10

    Versions
    • 2:6.1.7.3+dfsg-7
    • 2:7.2.2.1+dfsg-7
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:26.10

    Versions
    • 2:7.2.3+dfsg-2
    • 2:7.2.3.2+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:26.04:LTS

    Versions
    • 2:7.2.2.1+dfsg-7
    • 2:7.2.2.2+dfsg-2
    • 2:7.2.3+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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