September 2, 2025 · Applied Cybernetics Group
CVE-2025-55177 — Meta Platforms WhatsApp
Meta Platforms WhatsApp Incorrect Authorization Vulnerability
- Added to KEV
2025-09-02- Federal due date
2025-09-23- Vendor
- Meta Platforms
- Product
- EPSS
- 89.6th percentile (score 0.041, as of
2026-07-13) - NVD CVSS v3.1
- 5.4 (MEDIUM)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2025-55177
CISA short description
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.
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.
NVD 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.