Meta Platforms WhatsApp Incorrect Authorization Vulnerability
Facebook — WhatsApp Desktop for Mac
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.
5.4
4.2%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Published
- Aug 29, 2025
- Modified
- Oct 18, 2026
- Added to KEV
- Sep 2, 2025
- Federal patch due
- Sep 23, 2025
CISA 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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
1 foundWeaponization
Public repositories whose name or description references CVE-2025-55177, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
References
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.
How severe is CVE-2025-55177?
CVE-2025-55177 has a CVSS base score of 5.4 out of 10 (CVSS 3.1).
Is CVE-2025-55177 actively exploited in the wild?
Yes. CVE-2025-55177 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Sep 2, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-55177?
4.2% - meaning FIRST.org's EPSS model estimates a 4.2% probability this vulnerability will be exploited in the wild within 30 days (90% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2025-55177?
We found 1 public GitHub repository referencing CVE-2025-55177, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2025-55177?
CVE-2025-55177 is classified under CWE-863 (CWE-863 Incorrect Authorization).
Cross-checked against
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