CVE-2025-53631CWE-79

flaskBlog XSS Vulnerability in postContent

Medium · published August 14, 2025

CVSS v4.0
5.3
EPSS
0%
Percentile
11.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
EPSS
0.00218 · 11.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2025-08-14T15:26Z
EPSS history
Timeline
  • 14 AUG 15:26Z
    flaskBlog XSS Vulnerability in postContent
    cvelistv5