CVE catalog
CVE-2026-43639
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/{provider
- Severity
- High · CVSS 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/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 - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.60% · Oct 25, 2026
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).
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | server | Not reported | 2026.4.0 | fixed |
| Cpe | server | Not reported | 2026.4.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | server | cpe | Not reported | 2026.4.0 | Not reported | Not reported | Not reported |
| Cpe | server | cpe | Not reported | 2026.4.0 | Not reported | NVD-CVE-2026-43639 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d]
- [https://github.com/bitwarden/server/pull/7372]
- [https://github.com/bitwarden/server/releases/tag/v2026.4.0]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-43639]
- [https://sanjokkarki.com.np/blog/bitwarden-provider-takeover]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1465.json]
- [https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)]