My Next Class

Today's episode covers eight eMudhra intermediate CA certificates revoked after a key generation error, an accelerated critical PHP security release fixing two core vulnerabilities, Oracle's October 2026 Critical Patch Update with 1,295 fixes including an Oracle E-Business Suite SQL injection, and a proof-of-concept exploit for a FortiSIEM gRPC path traversal leading to remote code execution.

eMudhra Intermediate CA Compromise
Eight intermediate CA certificates from Indian certificate authority eMudhra were revoked after a scripting error during the HSM key ceremony left their private keys one byte long. Browsers now reject them, but software with its own CA bundle, like curl on macOS, may need updating. The post includes a browser test page.
https://emudhra.we-have-a-problem.com/

Upcoming Critical PHP Security Release
PHP fixes two critical vulnerabilities in PHP core, rated CVSS 9.2, affecting versions back to PHP 5. The release was moved up to Wednesday, October 21st at 14:00 UTC (10 a.m. Eastern) after details leaked. Expect exploits soon after the patch.
https://www.php.net/archive/2026.php#2026-10-20-1

Oracle Critical Patch Update Advisory - October 2026
Oracle's quarterly update fixes 1,295 new vulnerabilities. Horizon3 is teasing details of an Oracle E-Business Suite SQL injection, CVE-2026-101767.
https://www.oracle.com/security-alerts/cpuoct2026.html
https://x.com/Horizon3Attack/status/2112651247362658611

FortiSIEM gRPC Path Traversal File Write RCE (CVE-2026-106173)
A proof of concept is out for the FortiSIEM flaw patched October 13th. It requires access to port 27918, so block it at the firewall until you patch.
https://horizon3.ai/attack-research/cve-2026-106173-deep-dive-fortisiem-grpc-path-traversal-file-write-rce/

My Upcoming Classes
https://www.sans.org/profiles/dr-johannes-ullrich

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