CVE-2026-48063

Baileys has message upsert / hist sync spoofing and app state corruption when using maliciously crafted protocolMessage payload

State: Published
Severity: 9.3 Critical
Published: Aug 3, 2026
Updated: Aug 4, 2026
Reserved: May 20, 2026

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Description

Baileys is a cocket-based TS/JavaScript API for WhatsApp Web. In versions prior to both 6.7.22 and 7.0.0-rc12, any Baileys session can be sent a malicious payload via the placeholderResendMessage and trigger a fake messages.upsert event with a fake message key and payload. This allows anyone to spoof messages. The same exploit also allows an attacker to corrupt the app state sync system by sending fake key shares, and also allows for history sync spoofing which also serves the same problem, injecting fake previous context or "on-demand" sync. This issue has been fixed in versions 6.7.22 and 7.0.0-rc12.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-290 Authentication Bypass by Spoofing
CWE-345 Insufficient Verification of Data Authenticity
CWE-346 Origin Validation Error

Affected Products

Product	Versions
BaileysWhiskeySockets	< 6.7.22Affected >= 7.0.0-rc.1, < 7.0.0-rc12Affected
@whiskeysockets/baileysWhiskeySockets	< 6.7.22Affected >= 7.0.0-rc.1, < 7.0.0-rc12Affected

References

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