CVE-2025-55177 — Meta Platforms WhatsApp Incorrect Authorization Vulnerability

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 ta

01What is this vulnerability?

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…

02Affected products

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2025-09-02. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-08-29T15:50:28.578Z
• Last modified: 2026-02-26T17:47:48.837Z
• Added to CISA KEV: 2025-09-02
• BOD 22-01 due: 2025-09-23

09References

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