CVE Feed

    Dashboard / CVE / CVE-2026-43639

    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/{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).

    Published:May 11, 2026
    Last Modified:May 16, 2026
    EPS:May 11, 2026
    EPSS Score:0.00046
    CVSS Score:8

    Affected Products

    Vendor
    Bitwarden
    Product
    Server

    Exploits

    https://sanjokkarki.com.np/blog/bitwarden-provider-takeover

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

    CVE-2026-71959 (CVSS 6.9) — Bitwarden Server before 2026.7.2 does not verify that the caller is a member of the organization identified in…
    CVE-2026-60104 (CVSS 9.3) — Bitwarden Server before 2026.6.0 does not verify that the email in a POST /auth-requests/admin-request body be…
    CVE-2026-57522 (CVSS 2.3) — Bitwarden Server before 2026.5.0 contains a JSON injection vulnerability in IntegrationTemplateProcessor.Repla…
    CVE-2026-57521 (CVSS 5.3) — Bitwarden Server before 2026.5.0 contains a broken access control vulnerability that allows any authenticated …
    CVE-2026-57520 (CVSS 7.1) — Bitwarden Server before 2026.5.0 contains a privilege escalation vulnerability that allows authenticated Custo…
    CVE-2026-43640 (CVSS 8.6) — Bitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rota…
    CVE-2026-43638 (CVSS 5.3) — Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticat…
    CVE-2020-15879 (CVSS 7.5) — Bitwarden Server 1.35.1 allows SSRF because it does not consider certain IPv6 addresses (ones beginning with f…
    CVE-2019-19766 (CVSS 7.5) — The Bitwarden server through 1.32.0 has a potentially unwanted KDF.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High