Trix: Stored XSS vulnerability through serialized attributes

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73426
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-18 15:17:08 UTC
Updated2026-08-18 18:19:33 UTC
DescriptionTrix 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.

Risk And Classification

Primary CVSS: v3.1 4.6 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.6MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
3.1CNADECLARED4.6MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Basecamp Trix affected < 2.1.17 Not specified

References

ReferenceSourceLinkTags
github.com/basecamp/trix/security/advisories/GHSA-qmpg-8xg6-ph5q [email protected] github.com
github.com/basecamp/trix/pull/1282 [email protected] github.com
github.com/basecamp/trix/commit/53197ab5a142e6b0b76127cb790726b274eaf1bc [email protected] github.com
github.com/basecamp/trix/releases/tag/v2.1.17 [email protected] github.com
github.com/basecamp/trix/commit/3229c29c771ded4d247ed79b2ccd2cd05c4e74b4 [email protected] github.com
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