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    CVE-2026-46431

    Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server's Access-Control-Allow-Origin response header was hardcoded to the wildcard * regardless of the caller's Origin. Because EventSource does not preflight and does not send cookies, the wildcard is sufficient to let any third-party page the developer visits open a cross-origin EventSource to the SSE port and read the live filename stream from JavaScript. This vulnerability is fixed in 1.17.7.

    Published:May 26, 2026
    Last Modified:May 27, 2026
    EPS:May 26, 2026
    EPSS Score:
    CVSS Score:4.3

    Affected Products

    Vendor
    Xyproto
    Product
    Algernon

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-48126 (CVSS 8.2) — Algernon is a small self-contained pure-Go web server. Prior to 1.17.8, when algernon is started with --domain…
    CVE-2026-46430 (CVSS 4.3) — Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:…
    CVE-2026-45728 (CVSS 7.5) — Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is invoked with a single…
    CVE-2026-45721 (CVSS 9) — Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is asked for any URL pat…
    CVE-2026-43981 (CVSS 8.2) — Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, in engine/luahandler.go, the sync.RWMu…
    CVE-2026-43982 (CVSS 8.7) — Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, uploadedFileSaveIn() in lua/upload/upl…

    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