Meta Platforms WhatsApp Incorrect Authorization Vulnerability
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.
- Vendor
- Meta Platforms
- Product
- CVSS
- 5.4
- EPSS (exploit probability)
- 4.7%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2025-55177 being exploited?
Yes. CISA added CVE-2025-55177 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 4.7% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Meta Platforms WhatsApp CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2019-18426 WhatsApp Cross-Site Scripting Vulnerability | [ HIGH ] | 8.2 | 67.9% | |
| CVE-2019-3568 WhatsApp VOIP Stack Buffer Overflow Vulnerability | [ CRITICAL ] | 9.8 | 30.1% |