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    CVE-2026-55549

    Yamcs is a mission control framework. Prior to 5.9.4, Yamcs reflects an attacker-controlled redirect_uri parameter from GET /auth/authorize into yamcs-core/src/main/resources/auth/templates/authorize.html without adequate HTML escaping by yamcs-core/src/main/java/org/yamcs/http/auth/AuthHandler.java and yamcs-core/src/main/java/org/yamcs/http/HandlerContext.java. A crafted authorization URL can execute JavaScript when opened by a Yamcs user. The script can access browser-held authentication material and transmit it to an attacker, enabling account compromise. This issue is fixed in version 5.9.4.

    Published:Aug 28, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 28, 2026
    EPSS Score:0.00361
    CVSS Score:6.5

    Affected Products

    Vendor
    Yamcs
    Product
    Yamcs

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-55559 (CVSS 9.8) — Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs inserts templateArgs from POST /api/in…
    CVE-2026-55552 (CVSS 7.5) — Yamcs is a mission control framework. Prior to 5.11.13, Yamcs StaticFileHandler.locateFile resolves an unauthe…
    CVE-2026-55547 (CVSS 4.3) — Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs omits SystemPrivilege.ControlAccess ch…
    CVE-2026-55545 (CVSS 6.5) — Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs WebSocket subscription handlers fail t…
    CVE-2026-55521 (CVSS 8.8) — Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs omits authorization checks in IndexesA…
    CVE-2026-55511 (CVSS 9.1) — Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs allows a user with SystemPrivilege.Con…
    CVE-2026-55548 (CVSS 4.3) — Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, the PacketsApi.exportPackets endpoint in yam…
    CVE-2026-46621 (CVSS 9.1) — Yamcs is a mission control framework. Prior to 5.12.7, the Yamcs script evaluation engine for Python algorithm…

    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