Vaultwarden: SSO Email Auto-Link Can Bind an Existing Local Account to an Attacker-Controlled IdP Identity

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Summary

CVECVE-2026-47164
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 16:16:46 UTC
Updated2026-07-15 18:15:13 UTC
DescriptionVaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.36.0, Vaultwarden's SSO login flow checked the IdP email_verified claim only for new-user creation and not when SSO_SIGNUPS_MATCH_EMAIL=true linked an IdP identity to an existing local account, allowing an attacker-controlled IdP identity asserting a victim email address to bind to and authenticate as that account. This issue is fixed in version 1.36.0.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS: 0.002700000 probability, percentile 0.187980000 (date 2026-07-19)

Problem Types: CWE-284 | CWE-284 CWE-284: Improper Access Control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Dani-garcia Vaultwarden affected < 1.36.0 Not specified

References

ReferenceSourceLinkTags
github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6x5c-84vm-5j56 [email protected] github.com
github.com/dani-garcia/vaultwarden/releases/tag/1.36.0 [email protected] github.com
github.com/dani-garcia/vaultwarden/commit/d297e274a35dccd0f5d935e9d5934e... [email protected] github.com
github.com/dani-garcia/vaultwarden/pull/7163 [email protected] github.com
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