CVE-2026-112958: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in apostrophecms apostrophe
Description
ApostropheCMS is an open-source Node.js content management system. Prior to 4.34.0, a project-defined free-form widget style field can carry an editor-controlled quote into an inline style attribute because the wrapper serializer does not apply HTML-attribute encoding. The quote can terminate the style attribute and inject executable attributes when published content, or an affected draft viewed by a higher-privileged user, is rendered. This issue is fixed in version 4.34.0.
CVSS v3.1
Score 5.4medium
Affected software
apostrophecms
apostrophe
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
ApostropheCMS, an open-source Node.js content management system, has a CWE-79 cross-site scripting vulnerability in versions before 4.34.0. The vulnerability arises because a project-defined free-form widget style field can include editor-controlled quotes that are not properly HTML-attribute encoded by the wrapper serializer. This flaw allows an attacker to terminate the inline style attribute and inject executable attributes when the content is rendered, either in published content or drafts viewed by users with higher privileges. The vulnerability is fixed in version 4.34.0.
Potential Impact
Successful exploitation can lead to limited confidentiality and integrity impacts via cross-site scripting, potentially allowing attackers to execute arbitrary scripts in the context of the affected user's browser. The vulnerability requires at least low privileges and user interaction, and does not affect availability.
Mitigation Recommendations
Upgrade ApostropheCMS to version 4.34.0 or later, where this vulnerability has been fixed. No other specific mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-19T21:30:47.246Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad7948a2cdf04f65641f462
Added to database: 10/20/2026, 16:19:22 UTC
Last enriched: 10/20/2026, 16:33:29 UTC
Last updated: 10/20/2026, 19:06:08 UTC
Views: 11
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