CVE-2026-6634
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceImproper authorization vulnerability in usememos memos up to 0.22.1 within the UpdateInstanceSetting component's memos_access_token function. The additionalStyle/additionalScript arguments are not properly validated, allowing unauthorized access or actions.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify memos installation and versionCheck your installed memos version by accessing the admin/settings page or checking the docker image tag/service versionAffected if The installed version is 0.22.1 or any earlier version (up to and including 0.22.1)
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Verify UpdateInstanceSetting component accessibilityInspect network requests or API endpoints related to instance settings (typically /api/v1/instance/setting or similar endpoint in memos)Affected if The endpoint accepts additionalStyle/additionalScript parameters without requiring elevated privileges
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Check authorization for additionalStyle/additionalScriptAttempt to access or modify the UpdateInstanceSetting function with a low-privilege user account or token that should not have instance-wide settings accessAffected if The additionalStyle/additionalScript arguments can be processed without proper authorization validation
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Inspect API response for privilege escalationSend a request to the instance settings endpoint with additionalStyle/additionalScript parameters using a non-admin account and observe if the request succeedsAffected if The system accepts and processes these arguments from an unauthorized user
You are affected if memos version 0.22.1 or earlier is running AND the UpdateInstanceSetting API accepts additionalStyle/additionalScript parameters without proper authorization checks.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement proper authorization checks and input validation for the additionalStyle/additionalScript arguments in the UpdateInstanceSetting component before processing.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-6634 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-6634 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
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- Version or environment caveats, and links to real fixes
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