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CVE-2026-73426: Trix: Stored XSS vulnerability through serialized attributes

• Severity: medium (CVSS 4.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-18 · updated 2026-10-22
• Weakness: CWE-79

Description

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.

Affected products

• basecamp trix: before 2.1.17

References

• https://github.com/basecamp/trix/commit/3229c29c771ded4d247ed79b2ccd2cd05c4e74b4
• https://github.com/basecamp/trix/commit/53197ab5a142e6b0b76127cb790726b274eaf1bc
• https://github.com/basecamp/trix/pull/1282
• https://github.com/basecamp/trix/releases/tag/v2.1.17
• https://github.com/basecamp/trix/security/advisories/GHSA-qmpg-8xg6-ph5q

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