CVE-2025-55177: whatsapp Auth Bypass

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.

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CVSS v3.1 Score

5.4

MEDIUM

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

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Sep 2, 2025 Remediation due: Sep 23, 2025

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
whatsapp	whatsapp	2.22.25.2 — 2.25.21.73
whatsapp	whatsapp	2.22.25.2 — 2.25.21.78
whatsapp	whatsapp_business	2.22.25.2 — 2.25.21.78

References

Advisories & Patches

https://www.facebook.com/security/advisories/cve-2025-55177 https://www.whatsapp.com/security/advisories/2025/

Other References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.4 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2025-55177? +

CVE-2025-55177 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-55177? +

CVE-2025-55177 affects products from whatsapp, specifically: whatsapp, whatsapp_business. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55177? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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