Threat actors are exploiting CVE-2026-4020 in the Gravity SMTP WordPress plugin active on over 100,000 sites, with Wordfence blocking more than 17 million attempts since a June 7 spike. The unauthenticated endpoint leaks API keys, email credentials, and detailed system information that can enable impersonation and targeted follow-on attacks.
The flaw exposes a REST API endpoint without authentication.
Exposed credentials enable impersonation and further attacks.
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CISA added Linux Kernel vulnerability CVE-2025-39682 to its Known Exploited Vulnerabilities catalog on 2026-09-18 with a federal remediation deadline of 2026-09-21. The flaw in the TLS receive path allows zero-length records to bypass recvmsg() handling, leading to incorrect processing assumptions, and agencies must apply vendor mitigations per BOD 26-04 or discontinue use of impacted EoL products.
Microsoft has disclosed CVE-2026-85893, a high-severity use-after-free vulnerability in Edge that could let an attacker elevate privileges from Low to Medium Integrity Level after a user visits a malicious page and performs two tap gestures. The flaw affects versions prior to 153.0.4234.32 and is rated CVSS 8.8, though exploitation is assessed as unlikely.
CISA added CVE-2026-76461, a SQL injection flaw in the Cisco email security appliance, to its Known Exploited Vulnerabilities catalog on 2026-09-14. Federal agencies have until 2026-09-17 to apply vendor mitigations under BOD 26-04, with forensic triage required.
Microsoft disclosed CVE-2026-69412, an 8.0-rated stack-based buffer overflow in Windows DHCP Server that lets an authenticated attacker execute code over an adjacent network, affecting Windows 10 1607. Patches are available while exploitation remains unlikely with no known attacks reported.
Microsoft disclosed CVE-2026-69298, an integer overflow in Windows Biometric Service that lets an authorized local attacker elevate to SYSTEM privileges with a CVSS score of 7.8. The patch is available now for affected Windows versions including Windows 10 Version 1607.
