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Cisco patches Secure Email Gateway zero-day exploited in attacks

September 15, 2026 · BleepingComputer · Severity: CRITICAL

Cisco warned customers to patch a critical Secure Email Gateway zero-day security flaw that threat actors have been exploiting in attacks.

Key Takeaways

  • Cisco has warned customers about active exploitation of a critical Secure Email Gateway zero-day vulnerability.
  • The flaw allows unauthenticated attackers to execute arbitrary commands with root privileges on affected appliances.
  • Administrators should apply the latest Cisco security updates for Secure Email Gateway immediately to mitigate active attacks.
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