Threats / Meta Platforms / CVE-2025-55177
CVE-2025-55177
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Meta Platforms WhatsApp vulnerability
WhatsApp contains an authorization flaw in linked device synchronization that allows an unrelated user to trigger content processing from arbitrary URLs on a target device.
Verdict
Today item — known-exploited.
An attacker can exploit incomplete authorization checks on linked device messages to cause a target device to fetch and process content from attacker-controlled URLs, potentially enabling credential theft, malware delivery, or information disclosure.
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Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
8 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-09-02).
Probability (EPSS)
EPSS 0.04116 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Meta Platforms, WhatsApp. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-863 Incorrect Authorization — weakness family: Authorization / access control.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious linked device synchronization message with a URL pointing to attacker-controlled content.
Business
Attackers gain a vector to deliver malware or phishing content to WhatsApp users without requiring direct contact or social engineering.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I send the message to a target whose device will process it due to missing authorization validation.
Business
The attack surface expands beyond authenticated contacts, increasing exposure across the user base.
3
Lateral reach — past segmentation narrative 3
Attacker
I host malicious content at the URL that the target device automatically fetches and processes.
Business
Sensitive data, credentials, or device integrity may be compromised through automatic content processing without user awareness.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
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