CVE-2026-47159 dani-garcia CVE debrief

Who should care

Defenders responsible for Vaultwarden instances, especially those exposed to untrusted networks or used by multiple organizations, should assess their exposure and prioritize upgrading to version 1.36.0 or later.

Why it matters

Defenders should care about CVE-2026-47159 because it allows for SSO-enabled organization enumeration and authentication workflow abuse in Vaultwarden instances. This vulnerability can be used to gather information about SSO-enabled organizations and potentially gain unauthorized access. Defenders responsible for Vaultwarden instances should assess their exposure, especially if the instances are exposed to untrusted networks or used by multiple organizations. Upgrading to version 1.36.0 or later is recommended.

• Enumeration of SSO-enabled organizations
• Abuse of authentication workflow
• Potential for unauthorized access

Technical summary

The vulnerability in Vaultwarden allows for SSO-enabled organization enumeration and authentication workflow abuse. An attacker can obtain organization-related SSO metadata for arbitrary email addresses, enabling enumeration of SSO-enabled organizations. A valid pre-validation JWT can be obtained with only the discovered identifier, allowing abuse of the authentication workflow. The issue was fixed in version 1.36.0.

Defensive priority

Defenders should prioritize verifying exposure of Vaultwarden instances to untrusted networks and upgrading to version 1.36.0 or later.

Recommended defensive actions

• Verify exposure of Vaultwarden instances to untrusted networks
• Upgrade to version 1.36.0 or later
• Monitor for suspicious authentication activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its impact, and the fix. However, additional information on exploitation or affected deployments is limited. The vulnerability allows for SSO-enabled organization enumeration and authentication workflow abuse. There is no evidence of exploitation in the wild, but defenders should verify exposure of Vaultwarden instances to untrusted networks and upgrade to version 1.36.0 or later. The fix addresses the issue by properly validating SSO metadata and preventing the return

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.