CVE-2025-55735: Dogukanurker Flaskblog

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Dogukanurker Flaskblog: up to and including 2.8.0

Published 2025-08-19. Last modified 2026-06-17.