flaskBlog Stored XSS Vulnerability_CVE-2025-55735

5.3 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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.

Basic Information

ID CVE-2025-55735

Source GitHub_M

Published Aug 19, 2025 at 18:56

Modified Aug 19, 2025 at 19:18

Affected Product

Vendor DogukanUrker

Product FlaskBlog

Version <= 2.8.0

Affected Versions DogukanUrker FlaskBlog <= 2.8.0

CWE Classification

CWE-79 CWE-807

References

github.com /DogukanUrker/FlaskBlog/security/advisories/GHSA-gj9v-qhc3-gcfx

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