CVE-2025-55735

Description

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.

Weakness classification

• security-advisories@github.com: CWE-79
• nvd@nist.gov: CWE-79

Primary references

• security-advisories@github.com — Exploit, Third Party Advisory