Improper Authorization in Usememos Memos by UseMemos
CVE-2026-6634

5.3MEDIUM

Key Information:

Vendor

Usememos

Status
Memos
Vendor
CVE Published:
20 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6634?

A vulnerability exists in Usememos Memos versions up to 0.22.1 due to improper authorization in the memos_access_token function located in the UpdateInstanceSetting component (src/App.tsx). This weakness allows attackers to manipulate arguments such as additionalStyle and additionalScript, enabling unauthorized actions from a remote location. Publicly available exploits for this issue increase the urgency for affected users to implement necessary security measures. The vendor has been informed of the issue but has not responded to mitigate the risk.

Affected Version(s)

memos 0.22.0

memos 0.22.1

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-2026-6634 - Proof of Concept

References

https://vuldb.com/vuln/358268
vdb-entrytechnical-description
https://vuldb.com/vuln/358268/cti
signaturepermissions-required
https://vuldb.com/submit/793432
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

davidgilmore (VulDB User)
VulDB CNA Team
.