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.
Published: 2025-08-19
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories
Source ID Title
EUVD EUVD EUVD-2025-25199 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.
History

Fri, 22 Aug 2025 21:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:dogukanurker:flaskblog:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'}


Thu, 21 Aug 2025 12:45:00 +0000

Type Values Removed Values Added
First Time appeared Dogukanurker
Dogukanurker flaskblog
Vendors & Products Dogukanurker
Dogukanurker flaskblog

Tue, 19 Aug 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 19 Aug 2025 19:00:00 +0000

Type Values Removed Values Added
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.
Title flaskBlog Stored XSS Vulnerability
Weaknesses CWE-79
CWE-807
References
Metrics cvssV4_0

{'score': 5.3, 'vector': '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'}


Subscriptions

Dogukanurker Flaskblog
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-08-19T19:18:45.395Z

Reserved: 2025-08-14T22:31:17.683Z

Link: CVE-2025-55735

cve-icon Vulnrichment

Updated: 2025-08-19T19:16:58.109Z

cve-icon NVD

Status : Analyzed

Published: 2025-08-19T19:15:37.620

Modified: 2025-08-22T20:57:15.983

Link: CVE-2025-55735

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-08-21T12:31:43Z

Weaknesses