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

criticalknown exploitedpublic exploitCVE-2025-55177
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Meta Platforms WhatsApp contains an incorrect authorization vulnerability due to an incomplete authorization of linked device synchronization messages. This vulnerability could allow an unrelated user to trigger processing of content from an arbitrary URL on a target’s device.

CSIRTS triage

vendor: Meta Platformsproduct: WhatsAppAuthentication bypass
What
An incorrect authorization vulnerability allows unrelated users to trigger processing of content from arbitrary URLs.
Who is affected
Users of WhatsApp with linked devices.
Urgency
Remediation is urgent as the vulnerability is actively exploited and is critical in severity.
Action
Users should update to the latest version of WhatsApp.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-09-02
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-55177

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-55177coverage & exploitation statusNVD · CVE.org

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