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CVE-2026-43639

8.0 · HIGH

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/{provi…

Published May 11, 2026CWE-862EPSS 0.84%

Overview

CVE-2026-43639 is a high-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 8.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1dGitHubgithub.com/bitwarden/server/pull/7372GitHubgithub.com/bitwarden/server/releases/tag/v2026.4.0Refsanjokkarki.com.np/blog/bitwarden-provider-takeoverRefwww.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43639?

CVE-2026-43639 is a high-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 8.0 (HIGH).

How severe is CVE-2026-43639?

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43639?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43639?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43639 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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