EUVD-2026-29170
GHSA-79fq-fw2p-vq3j
CVSS VectorNVD
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionNVD
Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via POST /providers/{providerId}/clients/existing, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true).
AnalysisAI
{providerId}/clients/existing endpoint, allowing authenticated provider users to add any organization to their provider without the target's consent. Publicly available exploit code exists (detailed writeup by Sanjok Karki), and vendor-released patch v2026.4.0 fully addresses the issue via GitHub PR #7372. …
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RemediationAI
{providerId}/clients/existing endpoint for unauthorized organization additions. Within 7 days: Apply vendor-released patch v2026.4.0 to all Bitwarden Server Cloud instances and rotate administrative credentials for affected organizations. …
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External POC / Exploit Code
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