CVE-2026-73426
Trix: Stored XSS vulnerability through serialized attributes
CVSS Score
4.6
EPSS Score
0.0%
EPSS Percentile
0th
Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.17, Trix is vulnerable to cross-site scripting when a data-trix-serialized-attributes attribute bypasses the DOMPurify sanitizer. An attacker can craft HTML containing a data-trix-serialized-attributes attribute with a malicious payload that, when rendered, executes arbitrary JavaScript in the user's session and may perform unauthorized actions or disclose sensitive information. This issue is fixed in version 2.1.17.
| CWE | CWE-79 |
| Vendor | basecamp |
| Product | trix |
| Published | Aug 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
basecamp / trix
< 2.1.17
References
github.com: https://github.com/basecamp/trix/security/advisories/GHSA-qmpg-8xg6-ph5q github.com: https://github.com/basecamp/trix/pull/1282 github.com: https://github.com/basecamp/trix/commit/3229c29c771ded4d247ed79b2ccd2cd05c4e74b4 github.com: https://github.com/basecamp/trix/commit/53197ab5a142e6b0b76127cb790726b274eaf1bc github.com: https://github.com/basecamp/trix/releases/tag/v2.1.17