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    CVE-2026-49955

    Hermes WebUI before version 0.51.270 contains a resource exhaustion vulnerability that allows unauthenticated remote attackers to degrade service availability by repeatedly calling the passkey options endpoint without completing assertion. Attackers can send unlimited POST requests to the authentication endpoint, causing unbounded growth of the challenge store file and excessive CPU and disk I/O through repeated JSON file rewrites.

    Published:Jun 9, 2026
    Last Modified:Jul 14, 2026
    EPS:Jun 9, 2026
    EPSS Score:0.00586
    CVSS Score:5.3

    Affected Products

    Vendor
    Get-hermes
    Product
    Hermes Web Ui
    Vendor
    Nesquena
    Product
    Hermes-webui

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-58174 (CVSS 6) — Hermes WebUI before 0.51.521 validates the workspace of an imported session under the active named profile but…
    CVE-2026-55205 (CVSS 6.9) — Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onb…
    CVE-2026-55198 (CVSS 7.1) — Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint tha…
    CVE-2026-55197 (CVSS 7.1) — Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that …
    CVE-2026-55196 (CVSS 9.1) — Hermes WebUI before 0.51.409 contains an authentication bypass vulnerability in passkey registration endpoints…
    CVE-2026-53871 (CVSS 8.6) — Hermes WebUI before 0.51.368 contains an authorization bypass vulnerability in the get_profile_cookie() functi…
    CVE-2026-49973 (CVSS 9.2) — Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthentic…
    CVE-2026-49959 (CVSS 8.7) — Hermes WebUI before version 0.51.311 contains a remote code execution vulnerability that allows authenticated …

    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