# CVE-2026-84203

## Summary

- **CVE ID:** CVE-2026-84203
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-613
- **Published:** Sep 1, 2026
- **Last Modified:** Sep 1, 2026

## Description

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.

## Affected Products

- usememos — memos (0.26.0)

## References

- [CNA](https://github.com/usememos/memos)
- [CNA](https://github.com/usememos/memos/blob/v0.30.0/server/router/api/v1/user_service.go)
- [CNA](https://github.com/usememos/memos/blob/v0.30.0/server/auth/authenticator.go)
- [CNA](https://www.vulncheck.com/advisories/memos-0.26.0-through-0.30.0-insufficient-session-expiration-on-password-change)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.1

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._