Flextype up to 1.0.0-alpha.3 Error Page getValidPluginsDependencies escape output

Summaryinfo

A vulnerability identified as problematic has been detected in Flextype up to 1.0.0-alpha.3. Affected is the function getValidPluginsDependencies of the component Error Page. This manipulation causes escape output. This vulnerability appears as CVE-2026-89145. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in Flextype up to 1.0.0-alpha.3 and classified as problematic. Affected by this vulnerability is the function getValidPluginsDependencies of the component Error Page. The manipulation with an unknown input leads to a escape output vulnerability. The CWE definition for the vulnerability is CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-89145 since 09/11/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/11/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Flextype

Version

• 1.0.0-alpha.0
• 1.0.0-alpha.1
• 1.0.0-alpha.2
• 1.0.0-alpha.3

Website

• Product: https://github.com/flextype/flextype/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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