CVE-2026-126069 Action View: Possible XSS vulnerability in Action View tag helpers
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-126069?
CVE-2026-126069 is a medium-severity vulnerability in rails, published on 10 Nov 2026.
Official description
Action View is a framework for handling view template lookup and rendering and provides view helpers for building HTML. Prior to 8.1.4.1 and 8.0.5.2, the fix for CVE-2026-33168 skips blank HTML attribute names in Action View tag helpers, but it tests the name before converting it to a string. A Symbol name made only of whitespace, such as :" ", is not blank, because Symbol#blank? is Symbol#empty?, so it reaches the attribute escaping, which emits an attribute with no name and produces malformed HTML. The asset tag helpers, such as image_tag, video_tag and audio_tag, symbolize their options, so a whitespace String name passed to them takes the same path. A carefully crafted attribute value could then be misinterpreted by the browser as a separate attribute name, possibly leading to XSS. Applications that allow users to specify custom HTML attribute names are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.
Weakness: CWE-79
Which versions are affected by CVE-2026-126069?
2 open source packages ship an affected version, including actionview.
| Package | Affected | Fixed in |
|---|---|---|
actionview RubyGems | All versions | 8.0.5.2 |
actionview RubyGems | From 8.1.0.beta1 | 8.1.4.1 |
How do I fix CVE-2026-126069?
Upgrade actionview to a fixed version for your release line: 8.0.5.2 or 8.1.4.1.
Is CVE-2026-126069 being exploited?
There is no known exploitation of CVE-2026-126069 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-126069, GHSA-68p9-83h6-5wpj, UBUNTU-CVE-2026-126069.