What’s Vulnerable › Vulnerabilities
CVE-2025-55735: flaskBlog Stored XSS Vulnerability
- Severity: medium (CVSS 5.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2025-08-19 · updated 2026-06-17
- Weakness: CWE-79
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.
Affected products
- DogukanUrker FlaskBlog: through 2.8.0
References
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