CVE-2025-55177

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 3.1

5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS

13% chance of exploitation in the next 30 days; higher than 96% of CVEs (scores of 2026-10-25)

CISA KEV

listed 2025-09-02, due 2025-09-23

CWE

CWE-863

Published

2025-08-29

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

Affected

• whatsapp:whatsapp
• whatsapp:whatsapp_business

References

• https://www.facebook.com/security/advisories/cve-2025-55177
• https://www.whatsapp.com/security/advisories/2025/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177

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