WhatsApp iOS/Mac 2.25.21.* Incomplete Auth for Linked Device Sync
CVE-2025-55177 Published on August 29, 2025
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 targets 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.
Known Exploited Vulnerability
This Meta Platforms WhatsApp Incorrect Authorization Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Meta Platforms WhatsApp contains an incorrect authorization vulnerability due to an incomplete authorization of linked device synchronization messages. This vulnerability could allow an unrelated user to trigger processing of content from an arbitrary URL on a target’s device.
The following remediation steps are recommended / required by September 23, 2025: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Versions
Facebook WhatsApp Desktop for Mac:- Version 2.22.25.2 and below 2.25.21.78 is affected.
- Version 2.22.25.2 and below 2.25.21.78 is affected.
- Version 2.22.25.2 and below 2.25.21.73 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.