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    CVE-2026-21881

    Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below is vulnerable to a critical authentication bypass when REVERSE_PROXY_AUTH is enabled. The application blindly trusts HTTP headers for user authentication without verifying the request originated from a trusted reverse proxy. An attacker can impersonate any user, including administrators, by simply sending a spoofed HTTP header. This issue is fixed in version 1.2.49.

    Published:Jan 8, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 8, 2026
    EPSS Score:0.00324
    CVSS Score:9.1

    Affected Products

    Vendor
    Kanboard
    Product
    Kanboard

    Exploits

    https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739whttps://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739w

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-57862 (CVSS 8.4) — Kanboard 1.2.52 and prior contains a server-side request forgery vulnerability that allows authenticated users…
    CVE-2026-58660 (CVSS 7.2) — Kanboard through 1.2.52, fixed in commit 564cc30, BoardAjaxController save() method (used by the kanban board …
    CVE-2026-56774 (CVSS 5.3) — Kanboard through 1.2.52, fixed in commit 928c68a, UserViewController::removeSession fails to validate the sess…
    CVE-2026-33058 (CVSS 8.4) — Kanboard is project management software focused on Kanban methodology. Versions prior to 1.2.51 have an authen…
    CVE-2026-29056 (CVSS 7) — Kanboard is project management software focused on Kanban methodology. Prior to 1.2.51, Kanboard's user invite…
    CVE-2026-25531 (CVSS 4.3) — Kanboard is project management software focused on Kanban methodology. Prior to 1.2.50, The fix for CVE-2023-3…
    CVE-2026-25924 (CVSS 8.4) — Kanboard is project management software focused on Kanban methodology. Prior to 1.2.50, a security control byp…
    CVE-2026-25530 (CVSS 4.3) — Kanboard is project management software focused on Kanban methodology. Prior to 1.2.50, the getSwimlane API me…
    CVE-2026-24885 (CVSS 5.7) — Kanboard is project management software focused on Kanban methodology. Prior to 1.2.50, a Cross-Site Request F…
    CVE-2026-21880 (CVSS 5.3) — Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below have an LDAP …

    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