CVE-2026-43639: Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients
bitwarden · server
Vendor fix available · Affected: bitwarden server · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 49% of scored CVEs
DescriptionCVE.org
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 products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- bitwarden · serverbefore 2026.4.0
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-43639 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.