CVE-2025-53631
BaseFortify
Publication date: 2025-08-14
Last updated on: 2025-08-21
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| dogukanurker | flaskblog | to 2.8.1 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in flaskBlog (versions 2.8.1 and prior) is caused by improper sanitization of the postContent field when users submit POST requests to /createpost. This allows attackers to inject arbitrary JavaScript code, leading to cross-site scripting (XSS) attacks. The malicious script can execute on all pages where the post content is reflected, including the homepage (/), individual post pages (/post/[ID]), admin posts page (/admin/posts), and user profile pages (/user/[ID]) of the user who made the post.
How can this vulnerability impact me? :
The vulnerability can lead to arbitrary JavaScript execution in the context of the affected user's browser. This can result in theft of session cookies, user impersonation, unauthorized actions performed on behalf of the user, and potential compromise of user accounts. It may also allow attackers to manipulate the content displayed to users or redirect them to malicious sites.
What immediate steps should I take to mitigate this vulnerability?
Since there are no public patches available at the time of publication, immediate mitigation steps include avoiding submitting untrusted or unsanitized content to the /createpost endpoint, restricting access to the affected endpoints (/createpost, /, /post/[ID], /admin/posts, /user/[ID]) to trusted users only, and monitoring for suspicious JavaScript execution in posts. Implementing additional input validation or sanitization at a proxy or web application firewall level may also help reduce risk until a patch is available.