Authenticated instance-setting changes via undisclosed authorization flaw
Published Apr 20, 2026 · Updated Apr 20, 2026
Improper authorization in Memos 0.22.0 and 0.22.1 allows remote authenticated users to alter instance style and script settings. The record attributes the flaw to UpdateInstanceSetting and the additionalStyle and additionalScript fields, but does not disclose the missing authorization check or how memos_access_token in src/App.tsx reaches that operation. A low-privileged account and network access are required; public evidence establishes unauthorized instance-setting changes but no more specific consequence.
Summary
What happened
Improper authorization in Memos 0.22.0 and 0.22.1 allows remote authenticated users to alter instance style and script settings. The record attributes the flaw to UpdateInstanceSetting and the additionalStyle and additionalScript fields, but does not disclose the missing authorization check or how memos_access_token in src/App.tsx reaches that operation. A low-privileged account and network access are required; public evidence establishes unauthorized instance-setting changes but no more specific consequence.
The record
- CVE
- CVE-2026-6634
- Published
- Apr 20, 2026
- Updated
- Apr 20, 2026
- Vendor
- Memos
- Product
- Memos
- Classifications
- CWE-285, CWE-266
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 20, 2026CVE publishedPublication date reported by the CVE source.
- Apr 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0.22.0
- Affected versionversion=0.22.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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