Stored Cross-Site Scripting Vulnerability in Microweber CMS
CVE-2026-67617

4.8MEDIUM

Key Information:

Vendor

Microweber

Status
Microweber
Vendor
CVE Published:
3 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-67617?

Microweber CMS versions up to 2.0.20 are vulnerable to a stored cross-site scripting flaw in the content tagging system. Authenticated administrators can exploit this weakness by injecting arbitrary JavaScript code through the tag_names parameter of the GET /api/save_content_admin endpoint. This vulnerability circumvents multiple layers of sanitization, including an ineffective XSS middleware for GET requests and a strip_unsafe() function limited in its execution. Malicious scripts can be saved and would execute on public blog pages and within the admin post editor, potentially leading to session riding attacks through CSRF tokens embedded in the page.

Affected Version(s)

microweber 0 <= 2.0.20

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-67617 - Proof of Concept

References

https://github.com/theopaid/Stored-XSS-via-Content-Tag-Na...
technical-descriptionexploit
https://www.vulncheck.com/advisories/microweber-cms-store...
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Theodosis Paidakis
.