CVE-2025-53631

flaskBlog XSS Vulnerability in postContent

CVSS 5.3 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.3EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

14 Aug 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

DogukanUrker · flaskBlog

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References

https://github.com/DogukanUrker/flaskBlog/security/advisories/GHSA-cj43-h8qf-7rw7