Vulnerability in Usememos Memos
CVE-2026-84203
Memos versions 0.26.0 through 0.30.0 fail to revoke refresh tokens when a user changes their password, allowing attackers to maintain account access. An attacker with a stolen refresh token can call the RefreshToken RPC to obtain new access tokens and rotate the refresh token indefinitely, bypassing the password change security measure.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.5% 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: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/usememos/memos (product)
- github.com/usememos/memos/blob/v0.30.0/server/router/api/v1/user_service.go (technical-description)
- github.com/usememos/memos/blob/v0.30.0/server/auth/authenticator.go (technical-description)
- www.vulncheck.com/advisories/memos-0.26.0-through-0.30.0-insufficient-session-e… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-84203?
- CVE-2026-84203 is a high-severity vulnerability in Usememos Memos, classified under Insufficient Session Expiration. CVSS score: 8.1/10. Published 2026-09-01.
- How severe is CVE-2026-84203?
- High severity. CVSS v3 base score is 8.1 out of 10.