Shadowserver finds 6,000+ likely vulnerable SmarterMail servers exposed online

Securityaffairs • January 27, 2026

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Shadowserver researchers found 6000+ SmarterMail servers exposed online and likely vulnerable to a critical auth bypass flaw .

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Over 6,000 SmarterMail Servers Exposed to Critical Vulnerability Shadowserver researchers identified over 6,000 SmarterMail servers exposed online, likely vulnerable to a critical authentication bypass flaw tracked as CVE-2026-23760. The vulnerability was disclosed by cybersecurity firm watchTowr on January 8, 2026. 2 sources 20

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