dani-garcia Vaultwarden up to 1.35.x SSO Authorization Flow /connect/authorize state improper authorization

Summaryinfo

A vulnerability marked as problematic has been reported in dani-garcia Vaultwarden up to 1.35.x. This affects the function authorize of the file /connect/authorize of the component SSO Authorization Flow. Performing a manipulation of the argument state results in improper authorization. This vulnerability is cataloged as CVE-2026-47158. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in dani-garcia Vaultwarden up to 1.35.x. This affects the function authorize of the file /connect/authorize of the component SSO Authorization Flow. The manipulation of the argument state with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. The summary by CVE is:

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.36.0, Vaultwarden's SSO authorization flow did not bind the OAuth state parameter accepted by /connect/authorize to the initiating browser session, allowed attacker-controlled PKCE parameters, and left SsoAuth records intact after failed token exchange, allowing an unauthenticated attacker to induce IdP authentication and redeem tokens for a fully authenticated session. This issue is fixed in version 1.36.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-47158 since 05/18/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 1.36.0 eliminates this vulnerability.

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Productinfo

Vendor

• dani-garcia

Name

• Vaultwarden

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35

Website

• Product: https://github.com/dani-garcia/vaultwarden/

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