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CVE-2025-55177

Medium 5.4 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Meta Platforms WhatsApp Incorrect Authorization Vulnerability
Added to catalog
Remediation due date (US federal)
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.

Metrics

CVSS 3.1
5.4 (MEDIUM) Score source: CNA CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS — exploit probability
14% (percentile: 96) as of 1 November 2026
CWE
CWE-863

Affected products

whatsapp: whatsapp; whatsapp: whatsapp business

References