Cross-organization vault access via unchecked group bindings
Published May 11, 2026 · Updated May 11, 2026
Improper authorization in Vaultwarden before 1.35.5 allows remote authenticated users to read and write another organization's vault data. Group-management endpoints persist supplied membership and collection IDs without checking that each belongs to the group's organization, while authorization queries trust the resulting cross-organization links. Exploitation requires one account to be an administrator in one organization, a confirmed member in another, and to use enabled groups; it exposes ciphers and permits item updates.
Summary
What happened
Improper authorization in Vaultwarden before 1.35.5 allows remote authenticated users to read and write another organization's vault data. Group-management endpoints persist supplied membership and collection IDs without checking that each belongs to the group's organization, while authorization queries trust the resulting cross-organization links. Exploitation requires one account to be an administrator in one organization, a confirmed member in another, and to use enabled groups; it exposes ciphers and permits item updates.
The record
- CVE
- CVE-2026-43912
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Vendor
- Dani Garcia
- Product
- Vaultwarden
- Classifications
- CWE-285, T1555
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- May 11, 2026CVE publishedPublication date reported by the CVE source.
- May 11, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.35.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- GHSA-569v-845w-g82p Minimal PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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