CVE-2026-6634 usememos UpdateInstanceSetting App.tsx memos_access_token improper authorization
Remote attackers can bypass authorization in usememos to modify instance settings, potentially leading to privilege escalation or code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6634?
CVE-2026-6634 is a medium-severity missing authorization vulnerability in usememos memos, published on 20 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-6634?
3 open source packages ship an affected version, including github.com/usememos/memos.
| Package | Affected | Fixed in |
|---|---|---|
github.com/usememos/memos Go | All versions | None |
github.com/usememos/memos Go | All versions to 0.22.1 | None |
github.com/usememos/memos Go | All versions to 0.22.1 | None |
How do I fix CVE-2026-6634?
No fix published yet.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-6634 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6634 exists.
Sources
Also known as GHSA-gqp3-hfc3-8q54, GO-2026-5403.