SmarterMail Auth Bypass Exploited in the Wild Two Days After Patch Release

A new security flaw in SmarterTools SmarterMail email software has come under active exploitation in the wild, two days after the release of a patch. The vulnerability, which currently does not have a CVE identifier, is tracked by watchTowr Labs as WT-2026-0001. It was patched by SmarterTools on January 15, 2026, with Build 9511, following responsible disclosure by the exposure management