Cisco Secure Email Gateway: attackers can read or change its database
OFFICIAL NAME: Cisco Secure Email Gateway SQL Injection Vulnerability
WHAT IT IS · EMAILIt carries internal and customer mail.
DO THIS FIRSTPatch it, or ask your email provider whether they have. Not sure if you use it? Send this page to your IT provider or security lead and ask.
TECHNICAL SUMMARY Cisco AsyncOS software for Cisco Secure Email Gateway (SEG) contains a SQL injection vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system.
WHY THIS VERDICT Attacks are confirmed. The vulnerability is 57 days old, so many systems are likely still unpatched. Ready-made attack tools are public. It affects a product that faces the internet or gives remote access. The severity score is critical (9.8).
WHY IT RANKS HERE Exploitation is confirmed by an authoritative source. The product faces the internet or gives remote access. Ready-made attack tools are public.
- HIGHEST CONFIRMED RUNG
- EXPLOITED
- CISA KEV
- LISTED
- EXPLOIT CODE
- READY TO USE
How far has it climbed?
01 TALK
▨ REPORTED, NOT CONFIRMEDNEWEST EVIDENCE · 1 SOURCECVE-2026-76461 discussed publicly (CIRCL sighting). CVE-2026-76461 discussed publicly (CIRCL sighting).
02 EXPOSED
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETWe have no source that counts exposed systems yet. Internet scan data needs a partnership we do not have. No evidence here does not mean nothing is exposed.
03 TRIED
■ CONFIRMEDNEWEST EVIDENCE · 2 INDEPENDENT SOURCESAttacks that worked are confirmed (step 4), so attempts count as confirmed too.
04 EXPLOITED
■ CONFIRMEDNEWEST EVIDENCE · 2 INDEPENDENT SOURCESCISA Vulnrichment marks CVE-2026-76461 as actively exploited. Cisco AsyncOS software for Cisco Secure Email Gateway (SEG) contains a SQL injection vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system.
05 DAMAGE
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETBreach notices and filings rarely name the flaw that was used, so we cannot link them to this event yet. No evidence here does not mean no harm.
When each thing happened
- DISCLOSED
- EXPLOIT CODE PUBLICDATE UNKNOWN
- FIRST ATTACK REPORT
- CISA KEV LISTING
- US FEDERAL DEADLINE
THE FIX
CISA's instruction: apply the vendor's fix, or stop using the product if no fix exists. The deadline CISA set for US federal agencies, Sep 17, 2026, has passed. It is a US government deadline; use it as a guide.
Questions to ask this week
- Do we run Cisco Secure Email Gateway? If yes, is it patched or cut off from the internet?
- Who owns fixing it, and by what date?
- Have we checked for signs of attack since the first report, not just since the patch?
How it unfolded
- Attack activity. SEP 13, 2026Cisco Secure Email Gateway SQL Injection Vulnerability
- SEP 13, 2026Metasploit exploit module: Cisco Secure Email Gateway ECS Message-ID SQL Injection RCE
- Attack activity. SEP 14, 2026CISA Vulnrichment marks CVE-2026-76461 as actively exploited
- SEP 14, 20264 public GitHub repositories claim a proof of concept for CVE-2026-76461
- NOV 3, 2026CVE-2026-76461 discussed publicly (CIRCL sighting) (4 reports, latest NOV 6)
SOURCES
- [1] CIRCL Vulnerability-Lookup sightings: CVE-2026-76461 discussed publicly (CIRCL sighting), NOV 6
- [2] PoC-in-GitHub: 4 public GitHub repositories claim a proof of concept for CVE-2026-76461, SEP 14
- [3] CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-76461 as actively exploited, SEP 14
- [4] CISA Known Exploited Vulnerabilities: Cisco Secure Email Gateway SQL Injection Vulnerability, SEP 13
- [5] Metasploit module metadata: Metasploit exploit module: Cisco Secure Email Gateway ECS Message-ID SQL Injection RCE, SEP 13
- [6] CIRCL Vulnerability-Lookup sightings: 3 more reports