CVE-2025-55177

Meta Platforms WhatsApp Incorrect Authorization Vulnerability

Exploited in attacks Medium 5.4 Attack chance: 13%

What it is

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.

CISA: 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.

What to do

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 US federal agencies: September 23, 2025

Added to the CISA list: September 2, 2025
Published: August 29, 2025
Severity: Medium 5.4 CVSS 3.1
Chance of attacks in the next 30 days (EPSS): 13% in the top 3.7% of all known vulnerabilities
Weakness: CWE-863
More details: NVD · CVE.org · CISA

All references (2)

More exploited flaws from Meta Platforms

Added	Vulnerability	Product	Severity	Attack chance
May 23, 2022	Cross-Site ScriptingCVE-2019-18426	WhatsApp	High 8.2	68%
Apr 19, 2022	VOIP Stack Buffer OverflowCVE-2019-3568	WhatsApp	Critical 9.8	30%

All of them →

Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.