CVE-2025-55177Known exploitationNetwork attack vector

Arbitrary URL processing via unauthorized synchronization messages

Published Aug 29, 2025 · Updated Feb 26, 2026

Incorrect authorization in WhatsApp for iOS, Business for iOS, and Mac allows remote authenticated users to trigger arbitrary URL processing. Linked-device synchronization accepts a message from an unrelated account without adequate authorization and directs the target device to process content from an attacker-chosen URL. No user interaction is required; Meta links the reported targeted exploitation to a chain with an Apple OS flaw that affected specific users.

CVSS severity5.4
Medium
EPSS probability4.21%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in WhatsApp for iOS, Business for iOS, and Mac allows remote authenticated users to trigger arbitrary URL processing. Linked-device synchronization accepts a message from an unrelated account without adequate authorization and directs the target device to process content from an attacker-chosen URL. No user interaction is required; Meta links the reported targeted exploitation to a chain with an Apple OS flaw that affected specific users.

The record

CVE
CVE-2025-55177
Published
Aug 29, 2025
Updated
Feb 26, 2026
Vendor
Meta Platforms, Inc.
Product
WhatsApp for iOS
Classifications
CWE-863, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2025Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
  3. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.22.25.2 <2.25.21.73

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Meta Platforms, Inc. · WhatsApp for iOSversion=2.22.25.2 <2.25.21.73
Meta Platforms, Inc. · WhatsApp Desktop for Macversion=2.22.25.2 <2.25.21.78
Meta Platforms, Inc. · WhatsApp Business for iOSversion=2.22.25.2 <2.25.21.78

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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