CVE-2026-112958 Details
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.
A stored cross-site scripting vulnerability has been identified in ApostropheCMS versions prior to 4.34.0. The issue arises when a project-defined free-form widget style field allows an editor to inject a double quote into an inline style attribute. This occurs because the wrapper serializer fails to apply proper HTML attribute encoding. As a result, the injected quote can terminate the style attribute and introduce executable attributes, such as event handlers, when the content is published or viewed by a higher-privileged user.
Users can update to ApostropheCMS version 4.34.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 20, 2026CISA-ADP
Assessed Oct 20, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-7jg5-frgc-c67w | CISA-ADP | AdvisoryRemedyVendor |
| https://github.com/apostrophecms/apostrophe/commit/06e4b377f3c360f9e89c32dccd7e505ad5ddf498 | [email protected] | Source CodeVendor |
| https://github.com/apostrophecms/apostrophe/commit/40b989b1a9dd23d30029b8ce7668634265cfe5ea | [email protected] | Source CodeVendor |
| https://github.com/apostrophecms/apostrophe/releases/tag/[email protected] | [email protected] | Release NotesVendor |
| https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-7jg5-frgc-c67w | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ApostropheCMS | < 4.34.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 20, 2026 | New CVE Received | [email protected] |
| Oct 20, 2026 | CVE Modified | CISA-ADP |