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Microsoft released emergency updates for Exchange Server to fix CVE-2026-96940, a high-severity flaw that can let attackers gain higher privileges. Microsoft has released out-of-band security updates for Exchange Server to fix a high-severity vulnerability tracked as CVE-2026-96940 (CVSS score of 8.8). The flaw is caused by weak authorization and can allow an authenticated attacker to […]

Microsoft has released out-of-band security updates to address a high-severity flaw in Microsoft Exchange Server that could allow an attacker to escalate privileges under certain conditions. The vulnerability, tracked as CVE-2026-96940, is rated 8.8 on the CVSS scoring system. "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a

Microsoft has pushed out an out-of-band security update for Exchange Server that fixes a high-severity vulnerability (CVE-2026-96940) that may allow authenticated attackers to read emails and attachments of other users in the same organization, but “does not allow access across tenant boundaries.” CVE-2026-96940 was discovered internally and, according to the Exchange Server Team, they “are not aware of active exploitation.” Nevertheless, Microsoft thinks that the flaw could be consistently exploited and notes that this type … More → The post Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940) appeared first on Help Net Security .

Nearly 22,000 Microsoft Exchange servers remain unpatched against CVE-2026-62911, a critical authentication bypass vulnerability, according to daily scans from the Shadowserver Foundation. The United States and Germany top the list with 6,200 and 5,100 unpatched servers. CVE-2026-62911 is a critical severity vulnerability, and Microsoft describes it as “authentication bypass by capture-replay in Microsoft Exchange Server,” which allows an authorized attacker to elevate privileges over a network. Microsoft released the fix on August 11, 2026, and … More → The post Nearly 22,000 Microsoft Exchange servers remain exposed to critical security flaw (CVE-2026-62911) appeared first on Help Net Security .

Microsoft Internet Key Exchange (IKE) Service Extensions contains a double free vulnerability that could enable remote code execution.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Exchange. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The ZDI has assigned a CVSS rating of 7.2. The following CVEs are assigned: CVE-2026-62911.

This vulnerability allows remote attackers to escalate privileges on affected installations of Microsoft Exchange. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-62911.

This vulnerability allows remote attackers to bypass authentication on affected installations of Microsoft Exchange. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-62911.

Russia-affiliated cyber espionage group Laundry Bear (aka Void Blizzard, aka TA488) is exploiting CVE-2026-42897, a cross-site scripting vulnerability in Microsoft Exchange, to target US and European government entities and a variety of private sector organizations via email. The warning comes from Proofpoint, who detected emails carrying the concealed exploit hitting inboxes. “The subject lines and lures are banal, likely so the targeted user opens and skims the message, but dismisses the message as junk without … More → The post Laundry Bear’s new Microsoft Exchange attack triggers on email open (CVE-2026-42897) appeared first on Help Net Security .

CVE-2026-42897 stems from a cross-site scripting (XSS) vulnerability and can allow an attacker to compromise Outlook Web Access (OWA) mailboxes.