CVE-2026-89145

Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory

MEDIUM
4.2
CVSS Score
Published: September 11, 2026 at 01:14 AM UTC
Updated: September 24, 2026 at 08:57 PM UTC
1 product affected across 1 vendorFlextype

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Severity
MEDIUM4.2
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.9.9 ≤ v ≤ 1.0.0-alpha.30.9.9

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.2MEDIUMVulnCheck
Attack Vector
LOCAL
Complexity
LOW
Privileges
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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