GHSA-v55j-83pf-r9cq
Rails has a possible XSS vulnerability in its Action View tag helpers
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | actionview | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
| RubyGems | actionview | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
| RubyGems | actionview | < 7.2.3.1 | 7.2.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
When a blank string is used as an HTML attribute name in Action View tag helpers, the attribute escaping is bypassed, producing malformed HTML. 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 attributes are affected.
### Releases
The fixed releases are available at the normal locations.
### Credit
This issue was responsibly reported by Hackerone researcher [taise](https://hackerone.com/taise).
References
External links from the advisory. They lead to third-party sites.
- https://github.com/rails/rails/security/advisories/GHSA-v55j-83pf-r9cq
- https://nvd.nist.gov/vuln/detail/CVE-2026-33168
- https://github.com/rails/rails/commit/0b6f8002b52b9c606fd6be9e7915d9f944cf539c
- https://github.com/rails/rails/commit/63f5ad83edaa0b976f82d46988d745426aa4a42d
- https://github.com/rails/rails/commit/c79a07df1e88738df8f68cb0ee759ad6128ca924
- https://github.com/rails/rails
- https://github.com/rails/rails/releases/tag/v7.2.3.1
- https://github.com/rails/rails/releases/tag/v8.0.4.1
- https://github.com/rails/rails/releases/tag/v8.1.2.1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionview/CVE-2026-33168.yml