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CVE-2025-55177

Meta Platforms WhatsApp Incorrect Authorization Vulnerability

Meta Platforms WhatsApp

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.

CVSS Score
5.4
Medium
EPSS — Exploit Probability
0.8%
Riskier than 74% of all CVEs
Exploitation
Confirmed in the wild
Used in ransomware campaigns
Remediation
Patch available
Federal deadline 2025-09-23
CISA 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. Deadline for federal agencies: 2025-09-23.

NVD entry Vendor patch PoC / advisory CISA KEV

1 article across 1 outlet · first covered May 25, 2026 · latest May 25, 2026

Coverage timeline