Cross-Site Scripting Vulnerability in Mereithhh VanBlog Image Upload Endpoint
CVE-2026-129259

5.1MEDIUM

Key Information:

Vendor

Mereithhh

Status
Vanblog
Vendor
CVE Published:
14 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-129259?

A vulnerability exists in the Mereithhh VanBlog up to version 0.54.0 that exposes the Image Upload Endpoint to cross-site scripting attacks. An attacker can manipulate the system remotely, allowing for the execution of malicious scripts in the context of a user’s session. This exploitation has been publicly disclosed, indicating a significant risk to users. Despite notifications sent to the vendor regarding this issue, no response has been received, highlighting the urgency for users to address potential security flaws.

Affected Version(s)

VanBlog 0.1

VanBlog 0.2

VanBlog 0.3

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-2026-129259 - Proof of Concept

References

https://vuldb.com/vuln/437297
vdb-entry
https://vuldb.com/vuln/437297/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-129259
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
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

Geronimo (VulDB User)
VulDB CNA Team
.