Russian hackers exploit Exchange OWA zero-day for long-term mailbox access

Russian hackers turn Exchange flaw into ‘half-click’ mailbox takeover

A Russia-aligned threat group used a “half-click” exploit against Microsoft Exchange’s Outlook Web Access to install a browser-based backdoor when recipients opened specially crafted emails. The campaign began on July 22 and was conducted by TA488, which is also tracked as Void Blizzard and Laundry Bear, according to a report from the cybersecurity firm Proofpoint. The attacks targeted government organizations in the US and Europe, as well as co…

Russian hackers exploit Exchange OWA zero-day for long-term mailbox access

The Russian state-sponsored hacking group Laundry Bear, also known as Void Blizzard, is exploiting an Exchange Outlook Web Access vulnerability in email campaigns to deliver a sophisticated backdoor called OWAReaper.

Russian Hackers Exploit Microsoft OWA Flaw to Keep Mailbox Access After Credential Rotation

The Russian threat actors recently linked to the exploitation of a now-patched vulnerability in Zimbra have been observed exploiting another vulnerability, this time in Microsoft Outlook Web Access (OWA), to target U.S. and European government entities, as well as the telecommunications, financial, hospitality, and aerospace sectors. The activity, which began on July 22, 2026, involves the

TA488 May Have Exploited Outlook Web Access 0-Day Flaw Before Microsoft’s Emergency Patch

TA488 has been linked to a new campaign that turns a routine Outlook Web Access email into a gateway for mailbox compromise. The operation abused a now-patched cross-site scripting flaw, tracked as CVE-2026-42897, and could run malicious code when a recipient opened a message in the webmail interface. The campaign targeted government bodies and organizations in telecommunications, finance, hospitality, and aerospace across the United States and …

Russian hackers exploit Exchange OWA zero-day for long-term mailbox access | #hacking | #cybersecurity | #infosec | #comptia | #pentest | #hacker - National Cyber Security Consulting

The Russian state-sponsored hacking group Laundry Bear, also known as Void Blizzard, is exploiting an Exchange Outlook Web Access vulnerability in email campaigns to deliver a sophisticated backdoor called OWAReaper. Email security company Proofpoint spotted the activity a week ago targeting various organizations, including government entities in the U.S. and Europe, and companies in the […] Thank you for subscribing to our RSS feed! The post Ru…