Bug 2444678 (CVE-2026-27803)

Summary: CVE-2026-27803 vaultwarden: Vaultwarden: Unauthorized collection management operations due to improper access control
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Vaultwarden. An authenticated manager, even when explicitly denied management privileges for a collection, could still perform various unauthorized management operations on that collection. This improper access control could lead to unauthorized information disclosure and data modification within the affected collection.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2444933, 2444934, 2444935, 2444936, 2444937, 2444938    
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Description OSIDB Bzimport 2026-03-04 22:01:27 UTC
Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, when a Manager has manage=false for a given collection, they can still perform several management operations as long as they have access to the collection. This issue has been patched in version 1.35.4.