CVE-2025-53631: 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 versions 2.8.1 and prior, improper sanitization of postContent when submitting POST requests to /createpost leads to arbitrary JavaScript execution (XSS) on all pages the post is reflected on including /, /post/[ID], /admin/posts, and /user/[ID] of the user that made the post. At time of publication, there are no public patches available.

Affected products

• Dogukanurker Flaskblog: up to and including 2.8.1

Published 2025-08-14. Last modified 2026-06-17.