#token-theft

Rapid7 published a working PoC for CVE-2026-55040 in mid-August. Exploitation telemetry spiked from one attempt to eight the following day, from eight IPs across five countries. Microsoft patched it in July.

Proofpoint attributes a browser implant exploiting CVE-2026-42897 to TA488. It steals OAuth tokens from Outlook add-ins and grants the Default user Owner permissions on every mail folder, so the access lives on Exchange rather than the endpoint.

CVE-2026-16232 (CVSS 9.3) lets an unauthenticated remote attacker obtain an application login token for Check Point Security Management and Multi-Domain Management servers, then use it with full administrative privileges. Check Point confirmed exploitation against a handful of customers.

NSA, CISA, and partner agencies detailed a year-long campaign against Zimbra Classic UI, tracked under several names including Void Blizzard and LAUNDRY BEAR, that pulled 90 days of mail, browser-saved passwords, and two-factor recovery codes from an authenticated session.

CVE-2026-55040 (CVSS 9.1) let a remote, unauthenticated attacker who knows a target's Active Directory SID or user principal name forge a valid session as that user in Microsoft SharePoint, no password or MFA involved at all.

CVE-2026-48558 lets an unauthenticated attacker forge OpenID Connect tokens against SimpleHelp remote-monitoring software configured for group login, gaining privileged technician access and bypassing MFA entirely. Arctic Wolf found it already being used to harvest credentials at scale.