CVE-2026-113657 Details
Description
ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From sanitize-html 2.17.7 until 2.18.0, an application configuration that permits namespace-prefixed SVG animation elements and the relevant URL-targeting attributes can bypass the SMIL URL protection because prefixed tag names do not match the unprefixed animation-element check. The bypass can rewrite a link destination to an unsafe URI after the sanitized SVG is rendered, with script execution occurring when a user activates the affected link; the default sanitizer configuration is not unconditionally affected. This issue is fixed in sanitize-html 2.18.0.
A vulnerability in ApostropheCMS's HTML sanitizer, sanitize-html, allows for cross-site scripting (XSS) attacks by bypassing URL protection on SVG animation elements. This issue affects sanitize-html versions 2.17.7 through 2.18.0. The vulnerability arises because namespace-prefixed tag names, such as 'svg:animate', are not correctly matched against the unprefixed animation element checks. As a result, an attacker can inject a 'javascript:' URI into an SVG animation element, which is executed when the corresponding link is clicked.
Users can update to sanitize-html version 2.18.0, 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-374f-7chj-9948 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce | [email protected] | Source CodeVendor |
| https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350 | [email protected] | Source CodeVendor |
| https://github.com/apostrophecms/apostrophe/releases/tag/[email protected] | [email protected] | Source CodeVendor |
| https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-374f-7chj-9948 | [email protected] | AdvisoryExploitRemedyVendor |
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 | All versions |
CPE
Remediation
| |
| sanitize-html | >= 2.17.7, < 2.18.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 20, 2026 | CVE Modified | CISA-ADP |
| Oct 20, 2026 | New CVE Received | [email protected] |