CVE-2025-55735
flaskBlog Stored XSS Vulnerability
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 5.3EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
19 Aug 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
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
Affected products
DogukanUrker · FlaskBlogWant to know if your infrastructure is exposed to this?
Talk to TrueHacking →