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TA488 Targets Zimbra Mailservers with Half-Click Exploits

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By Greg Lesnewich, Nick Attfield, Konstantin Klinger, Saher Naumaan, Mark Kelly, and the Proofpoint Threat Research Team

July 23, 2026 Greg Lesnewich, Nick Attfield, Konstantin Klinger, Saher Naumaan, Mark Kelly, and the Proofpoint Threat Research Team

Proofpoint is releasing this report in coordination with NSA and FBI’s JSAC reporting about TA488/Void Blizzard, which can be found here. This is part 1 of a 2-part blog series Proofpoint is publishing about Russian espionage actors using half-click exploits to target government webmail servers. Read part 2 about TA45…

The opening of the report, shown for reference. The full report, with its figures and indicators, is published by Proofpoint on proofpoint.com.

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