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    CVE-2020-26029

    An issue was discovered in Zammad before 3.4.1. There are wrong authorization checks for impersonation requests via X-On-Behalf-Of. The authorization checks are performed for the actual user and not the one given in the X-On-Behalf-Of header.

    Published:Dec 28, 2020
    Last Modified:Nov 21, 2024
    EPS:Dec 28, 2020
    EPSS Score:0.00215
    CVSS Score:6.5

    Affected Products

    Vendor
    Zammad
    Product
    Zammad

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-863 Incorrect Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-13229 (CVSS 7.1) — Zammad 7.1.0 contains an authenticated improper authorization vulnerability in the ticket article attachment c…
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    CVE-2026-34782 (CVSS 5.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the REST endpoin…
    CVE-2026-34724 (CVSS 8.7) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, a server-side template inj…
    CVE-2026-34723 (CVSS 8.7) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, unauthenticated …
    CVE-2026-34722 (CVSS 6.9) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the used endpoin…
    CVE-2026-34721 (CVSS 5.9) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callba…
    CVE-2026-34720 (CVSS 2.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanis…
    CVE-2026-34719 (CVSS 8.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the webhook mode…
    CVE-2026-34718 (CVSS 5.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the HTML sanitiz…

    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