dani-garcia Vaultwarden up to 1.35.x SSO Discovery/Pre-Validation Flow information disclosure

Summaryinfo

A vulnerability identified as problematic has been detected in dani-garcia Vaultwarden up to 1.35.x. The affected element is an unknown function of the component SSO Discovery/Pre-Validation Flow. This manipulation causes information disclosure. This vulnerability is tracked as CVE-2026-47159. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in dani-garcia Vaultwarden up to 1.35.x. Affected by this vulnerability is some unknown functionality of the component SSO Discovery/Pre-Validation Flow. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.36.0, Vaultwarden's SSO discovery and pre-validation flow returned organization-related SSO metadata including organizationIdentifier values for arbitrary email addresses and allowed a valid pre-validation JWT to be obtained with only the discovered identifier, enabling SSO-enabled organization enumeration and authentication workflow abuse. This issue is fixed in version 1.36.0.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-47159 since 05/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

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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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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