---
title: "CVE-2025-55177: Meta Platforms WhatsApp Incorrect Authorization Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-55177/
description: "CVE-2025-55177 (Meta Platforms WhatsApp): Exploited in the wild (CISA KEV). Incomplete authorization of linked device synchronization messages in WhatsApp…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-08-29
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-55177"
kev: true
cvss: 5.4
epss: 0.04734
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-55177: Meta Platforms WhatsApp Incorrect Authorization Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Meta Platforms WhatsApp. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-09-02, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-09-23 ; treat that as the outer limit, not the target.
- EPSS 4.7% , percentile 92: FIRST’s model estimates a 4.7% chance of exploitation activity in the next 30 days, higher than 92% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.

## 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.

## Affected products (CVE record)

- Facebook WhatsApp Desktop for Mac: 2.22.25.2 < 2.25.21.78
- Facebook WhatsApp Business for iOS: 2.22.25.2 < 2.25.21.78
- Facebook WhatsApp for iOS: 2.22.25.2 < 2.25.21.73

## Severity

- facebook CVSS 3.1: 5.4 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C`

## Exploitation

- CISA KEV: added 2025-09-02; federal due date 2025-09-23. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 4.73% probability of exploitation activity in the next 30 days; percentile 92.

## Sources

- [Listed in CISA KEV notes (whatsapp.com)](https://www.whatsapp.com/security/advisories/2025/)
- [CVE.org record CVE-2025-55177](https://www.cve.org/CVERecord?id=CVE-2025-55177)
- [NVD entry CVE-2025-55177](https://nvd.nist.gov/vuln/detail/CVE-2025-55177)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177)
- [facebook.com](https://www.facebook.com/security/advisories/cve-2025-55177)

---
Source page: https://erroneo.us/security/cve/CVE-2025-55177/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt