DogukanUrker FlaskBlog up to 2.8.0 /template/routes.html postContent cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in DogukanUrker FlaskBlog up to 2.8.0. This affects an unknown function of the file /template/routes.html. Executing a manipulation of the argument postContent can lead to cross site scripting. This vulnerability is registered as CVE-2025-55735. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in DogukanUrker FlaskBlog up to 2.8.0. This vulnerability affects an unknown part of the file /template/routes.html. The manipulation of the argument postContent with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

flaskBlog is a blog app built with Flask. In 2.8.0 and earlier, when creating a post, there's no validation of the content of the post stored in the variable "postContent". The vulnerability arises when displaying the content of the post using the | safe filter, that tells the engine to not escape the rendered content. This can lead to a stored XSS inside the content of the post. The code that causes the problem is in template/routes.html.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-55735 since 08/15/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:template/routes.html it is possible to find vulnerable targets with Google Hacking.

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

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• DogukanUrker

Name

• FlaskBlog

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8.0

Website

• Product: https://github.com/DogukanUrker/FlaskBlog/

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