CVE-2026-73426: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in basecamp trix
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.
AI Analysis
Technical Summary
CVE-2026-73426 describes a cross-site scripting vulnerability in the Trix rich text editor before version 2.1.17. The vulnerability occurs due to improper neutralization of input in the data-trix-serialized-attributes attribute, which bypasses the DOMPurify sanitizer. An attacker can craft HTML with this attribute containing malicious JavaScript that executes in the context of the user's session, potentially leading to unauthorized actions or information disclosure. The issue is resolved in Trix version 2.1.17.
Potential Impact
Exploitation of this vulnerability allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session. This can result in unauthorized actions performed on behalf of the user or disclosure of sensitive information accessible within the session. The CVSS score of 4.6 indicates a medium severity impact with network attack vector, low complexity, requiring user interaction and low privileges.
Mitigation Recommendations
Upgrade Trix to version 2.1.17 or later, where this cross-site scripting vulnerability is fixed. No other specific mitigations are indicated. Patch status is confirmed by the vendor's versioning information.
CVE-2026-73426: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in basecamp trix
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.
CVSS v3.1
Score 4.6medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-73426 describes a cross-site scripting vulnerability in the Trix rich text editor before version 2.1.17. The vulnerability occurs due to improper neutralization of input in the data-trix-serialized-attributes attribute, which bypasses the DOMPurify sanitizer. An attacker can craft HTML with this attribute containing malicious JavaScript that executes in the context of the user's session, potentially leading to unauthorized actions or information disclosure. The issue is resolved in Trix version 2.1.17.
Potential Impact
Exploitation of this vulnerability allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session. This can result in unauthorized actions performed on behalf of the user or disclosure of sensitive information accessible within the session. The CVSS score of 4.6 indicates a medium severity impact with network attack vector, low complexity, requiring user interaction and low privileges.
Mitigation Recommendations
Upgrade Trix to version 2.1.17 or later, where this cross-site scripting vulnerability is fixed. No other specific mitigations are indicated. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-12T14:32:11.796Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a846d94c6e8be0332554692
Added to database: 08/18/2026, 14:35:00 UTC
Last enriched: 08/18/2026, 14:50:38 UTC
Last updated: 08/18/2026, 17:50:23 UTC
Views: 7
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