CVE-2025-55177

Facebook WhatsApp Desktop for Mac, Facebook WhatsApp Business for iOS, Facebook WhatsApp for iOS

Published 29 Aug 2025 · updated 17 Jun 2026 · Analyzed

5.4 Medium · CVSS 3.1, fb.com

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 2 Sept 2025, with a remediation deadline of 23 Sept 2025 for US federal agencies.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

Incomplete authorization of linked device synchronization messages in WhatsApp for iOS prior to v2.25.21.73, WhatsApp Business for iOS v2.25.21.78, and WhatsApp for Mac v2.25.21.78 could have allowed an unrelated user to trigger processing of content from an arbitrary URL on a target’s device. We assess that this vulnerability, in combination with an OS-level vulnerability on Apple platforms (CVE-2025-43300), may have been exploited in a sophisticated attack against specific targeted users.

References