Auth bypass in Usememos Memos
CVE-2026-6634
A weakness has been identified in usememos memos up to 0.22.1. This affects the function memos_access_token of the file src/App.tsx of the component UpdateInstanceSetting. This manipulation of the argument additionalStyle/additionalScript causes improper authorization. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (25.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
- Usememos Memos — versions 0.22.0, 0.22.1
Weakness classification (CWE)
References
- vuldb.com/vuln/358268 (technical-description, vdb-entry)
- vuldb.com/vuln/358268/cti (signature, permissions-required)
- vuldb.com/submit/793432 (third-party-advisory)
- github.com/Dave-gilmore-aus/security-advisories/blob/main/usememos-security-adv… (exploit)
Frequently asked questions
- What is CVE-2026-6634?
- CVE-2026-6634 is a medium-severity vulnerability in Usememos Memos, classified under Incorrect Privilege Assignment. CVSS score: 6.3/10. Published 2026-04-20.
- How severe is CVE-2026-6634?
- Medium severity. CVSS v3 base score is 6.3 out of 10.