--- title: "Security digest: September 14, 2026" url: https://erroneo.us/security/2026-09-14/ description: "September 14, 2026 vulnerability digest: 1 brief (Cisco Secure Email Gateway: Two Exploited Root…); 1 CISA KEV addition (Cisco); 1 critical advisory (PyPI).…" type: security-digest-day section: "Security Digest" date_published: 2026-09-14 date_modified: 2026-10-21 publisher: erroneo.us author: erroneo.us Security Desk license: All rights reserved. Quote with attribution and a link. --- # Security digest: September 14, 2026 1 editorial brief, 1 known exploited (cisa kev) addition and 1 critical advisory. ## Take stock - Act now: Cisco Secure Email Gateway: Two Exploited Root RCE Bugs . Anyone running physical or virtual Cisco Secure Email Gateway on AsyncOS before 15.5.5-014, 16.0.x, or 16.5 before 16.5.0-780, including teams that moved to 16.0.4-302, which fixes only CVE-2026-76461. - Do you run any of these? Cisco Secure Email Gateway. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-09-17. - PyPI: 1 critical advisory ( esphome-device-builder ). Check with pip-audit (or: pip show ) . - None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully. ## Editorial briefs - **Act now** [Cisco Secure Email Gateway: Two Exploited Root RCE Bugs](https://erroneo.us/security/briefs/cisco-secure-email-gateway-cve-2026-76461-76519-root-rce/index.md): Every on-premises Secure Email Gateway below 15.5.5-014 or 16.5.0-780 can be rooted by an email and both bugs are exploited: upgrade now, and check for compromise before and after, because attackers can wipe local evidence. ## Known exploited (CISA KEV) - [CVE-2026-76461](https://erroneo.us/security/cve/CVE-2026-76461/index.md) Cisco Secure Email Gateway: Cisco Secure Email Gateway SQL Injection Vulnerability (CISA due 2026-09-17) ## Critical advisories - [CVE-2026-59178](https://erroneo.us/security/cve/CVE-2026-59178/index.md) ESPHome Device Builder: Renamed auth env vars silently disable dashboard authentication on upgrade — PyPI esphome-device-builder < 1.0.12 → 1.0.12 --- Source page: https://erroneo.us/security/2026-09-14/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt