flaskBlog XSS Vulnerability in postContent
Priority MEDIUM 57CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00242 15th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| DogukanUrker | flaskBlog | up to 2.8.1 | — | No fix listed | CNA |
- flaskBlog VendorDogukanUrker Affected up to 2.8.1 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dogukanurker:flaskblog:*:*:*:*:*:*:*:* | up to 2.8.1 | Vulnerable | DogukanUrker |
- cpe:2.3:a:dogukanurker:flaskblog:*:*:*:*:*:*:*:* Versions up to 2.8.1 Vulnerable ·DogukanUrker
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-53631
References
More DogukanUrker Flaskblog vulnerabilities
- TI-2025-35157 flaskBlog allows arbitrary privilege escalation CVSS 4.0CRITICAL 9.3
- TI-2025-20720 Incorrect access control in laskBlog v2.6.1 allows attackers to access all usernames via a crafted input. CVSS 3.1CRITICAL 9.1
- TI-2025-35158 flaskBlog arbitrary comment delete CVSS 4.0MEDIUM 6.9
- TI-2025-35155 flaskBlo Authorization Bypass CVSS 4.0MEDIUM 6.9
- TI-2025-20717 An arbitrary file deletion vulnerability in the /post/{postTitle} component of flaskBlog… CVSS 3.1MEDIUM 6.5
- TI-2024-14987 User profile page vulnerable to Cross Site Scripting (XSS) in flaskBlog CVSS 3.1MEDIUM 6.5
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences