# CVE-2026-126069: Action View: Possible XSS vulnerability in Action View tag helpers


- **Severity:** Medium 4.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 10 Nov 2026
- **Updated:** 10 Nov 2026
- **Also known as:** DEBIAN-CVE-2026-126069, GHSA-68p9-83h6-5wpj, UBUNTU-CVE-2026-126069

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-126069?

2 open source packages ship an affected version, including actionview.


| Package | Ecosystem | 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-126069 and fix it if it is affected.

What it is: CVE-2026-126069 is a medium-severity vulnerability in rails, published on 10 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-126069 in the wild and no public exploit code.

Affected packages and fixed versions:
- actionview (RubyGems): affected all versions; fixed in 8.0.5.2
- actionview (RubyGems): affected from 8.1.0.beta1; fixed in 8.1.4.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-126069/ (Markdown: https://insights.sbomify.com/CVE-2026-126069/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-126069
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126069
- OSV: https://osv.dev/vulnerability/CVE-2026-126069

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-126069/
Summaries are generated and may contain mistakes; the official description above is the record.