CVE-2025-55735— flaskBlog Stored XSS Vulnerability
Quick assessment
Affected
DogukanUrker FlaskBlog
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
FlaskBlog是Doğukan Ürker个人开发者的一个使用 Flask 构建的简单博客应用程序。 FlaskBlog 2.8.0及之前版本存在安全漏洞，该漏洞源于未验证帖子内容可能导致存储型跨站脚本。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2025-55735
Vulnerability Information
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Vulnerability Title
flaskBlog Stored XSS Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
FlaskBlog 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlaskBlog是Doğukan Ürker个人开发者的一个使用 Flask 构建的简单博客应用程序。 FlaskBlog 2.8.0及之前版本存在安全漏洞，该漏洞源于未验证帖子内容可能导致存储型跨站脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| DogukanUrker | FlaskBlog | <= 2.8.0 | - |
|
II. Public POCs for CVE-2025-55735
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · DogukanUrker · 2025-08-19 · 4 CVEs total
| CVE-2025-55734 | flaskBlo Authorization Bypass | |
| CVE-2025-55736 | flaskBlog allows arbitrary privilege escalation | |
| CVE-2025-55737 | flaskBlog arbitrary comment delete |
IV. Related Vulnerabilities
Same product: FlaskBlog
Same vendor: DogukanUrker
Same weakness: CWE-79
-
CVE-2026-55779
Silverstripe Versioned: XSS in archive admin restore -
CVE-2026-55696
PrivateBin: Stored Cross-Side-Scripting (XSS) vulnerability -
CVE-2026-76798
MongoSQL Transition Readiness Tool Improper Output Encoding -
CVE-2026-76794
MongoDB BI Connector Transition Readiness Report Improper HT -
CVE-2026-55566
Yamcs: DOM XSS in Extension Routing
V. Comments for CVE-2025-55735
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