---
title: "CVE-2026-48063: Baileys has message upsert / hist sync spoofing and app state corruption when using maliciously crafted protocolMessage payload"
url: https://erroneo.us/security/cve/CVE-2026-48063/
description: "CVE-2026-48063 (baileys (npm)): 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…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-03
date_modified: 2026-08-04
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-48063"
kev: false
cvss: 9.3
epss: 0.00223
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-48063: Baileys has message upsert / hist sync spoofing and app state corruption when using maliciously crafted protocolMessage payload

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.2% , percentile 12: FIRST’s model estimates a 0.2% chance of exploitation activity in the next 30 days, higher than 12% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes baileys (npm) < 6.7.22, fixed in 6.7.22 ; @whiskeysockets/baileys (npm) < 6.7.22, fixed in 6.7.22 ; baileys (npm) >= 7.0.0-rc.1, < 7.0.0-rc12, fixed in 7.0.0-rc12 ; @whiskeysockets/baileys (npm) >= 7.0.0-rc.1, < 7.0.0-rc12, fixed in 7.0.0-rc12 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `baileys` < 6.7.22 → fixed: 6.7.22
- npm `@whiskeysockets/baileys` < 6.7.22 → fixed: 6.7.22
- npm `baileys` >= 7.0.0-rc.1, < 7.0.0-rc12 → fixed: 7.0.0-rc12
- npm `@whiskeysockets/baileys` >= 7.0.0-rc.1, < 7.0.0-rc12 → fixed: 7.0.0-rc12

## Affected products (CVE record)

- WhiskeySockets Baileys: < 6.7.22, >= 7.0.0-rc.1, < 7.0.0-rc12
- WhiskeySockets @whiskeysockets/baileys: < 6.7.22, >= 7.0.0-rc.1, < 7.0.0-rc12

## Severity

- GitHub_M CVSS 4.0: 9.3 `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 CVSS 4.0: 9.3 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.22% probability of exploitation activity in the next 30 days; percentile 12.

## Sources

- [GitHub Advisory GHSA-qvv5-jq5g-4cgg](https://github.com/advisories/GHSA-qvv5-jq5g-4cgg)
- [CVE.org record CVE-2026-48063](https://www.cve.org/CVERecord?id=CVE-2026-48063)
- [NVD entry CVE-2026-48063](https://nvd.nist.gov/vuln/detail/CVE-2026-48063)
- [github.com](https://github.com/WhiskeySockets/Baileys/security/advisories/GHSA-qvv5-jq5g-4cgg)
- [github.com](https://github.com/WhiskeySockets/Baileys/commit/3beb08eecfcb4e65722e674034bd84fb11a9de35)

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Source page: https://erroneo.us/security/cve/CVE-2026-48063/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt