CVE•Published 2026-05-26•Modified 2026-05-26•0 articles on news•5 live references•NVD data
CVE-2026-46431
Vulnerability data via NVD (ingested)
CVSS v3.1
4.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS percentile
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Description
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.
Timeline
Published 2026-05-26
Modified 2026-05-26
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-46431Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-46431Censys host search filtered to this CVE id.
grep.app
CVE-2026-46431Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-46431GitHub code search for direct mentions.
Google dork
"CVE-2026-46431" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-46431 on GitHub.
We haven't classified any articles referencing CVE-2026-46431 yet. The external references above still apply.