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    CVE-2026-43638

    Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collections` array, which causes the server-side permission check to be skipped.

    Published:May 11, 2026
    Last Modified:May 16, 2026
    EPS:May 11, 2026
    EPSS Score:0.00028
    CVSS Score:5.4

    Affected Products

    Vendor
    Bitwarden
    Product
    Server

    Exploits

    https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

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    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-2026-43639 (CVSS 8.9) — Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider serv…
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    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