CVE-2026-89145 Details
Description
Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies(). Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts in users' browsers when dependency validation fails.
A stored cross-site scripting vulnerability has been identified in Flextype CMS versions 0.9.9 prior to 1.0.0-alpha.3. The issue arises because the application fails to properly HTML-escape plugin directory names on the dependency error page. This flaw allows attackers with write access to the plugins directory to create plugins with HTML characters in their names. When the dependency validation fails, the injected scripts are executed in the browsers of users viewing the page.
It is recommended to update Flextype CMS to a version that addresses this vulnerability. As of now, users should manually HTML-escape plugin directory names before rendering them in the dependency error page.
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 Sep 11, 2026CISA-ADP
Assessed Sep 11, 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/flextype/flextype | [email protected] | Vendor |
| https://github.com/flextype/flextype/blob/aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d/src/flextype/core/Plugins.php#L345 | [email protected] | Source CodeVendor |
| https://github.com/flextype/flextype/issues/597 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/flextype-cms-0.9.9-through-1.0.0-alpha.3-stored-xss-via-plugin-directory | [email protected] | AdvisoryBundle |
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 |
|---|---|
| Flextype | >= 0.9.9, <= 1.0.0-alpha.3 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 11, 2026 | CVE Modified | CISA-ADP |
| Sep 11, 2026 | New CVE Received | [email protected] |