CVE-2026-43639
8.9
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
Summary
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).
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bitwarden | server | 0 < 2026.4.0 | affected |
Weaknesses
- CWE-862: Missing Authorization
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: no
- Technical Impact: total
References
- https://sanjokkarki.com.np/blog/bitwarden-provider-takeover
- https://github.com/bitwarden/server/releases/tag/v2026.4.0
- https://github.com/bitwarden/server/pull/7372
- https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d
- https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients
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