# CVE-2026-121640: WatchGuard AuthPoint Gateway authentication bypass by capture-replay

Source: https://junglewise.ai/threats/cve-2026-121640-an-authentication-bypass-by-capture-replay-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-04. Updated: 2026-11-04  
License: CC BY 4.0 with a link back

CVE-2026-121640 · Severity: info · Published 2026-11-04

WatchGuard AuthPoint Gateway is an authentication service that protects access to corporate networks and systems. An attacker who observes legitimate authentication traffic between gateway components can replay captured requests to bypass authentication and take unauthorized administrative actions, including disabling authentication services entirely.

Technologies: [Watchguard AuthPoint Authentication Gateway](https://junglewise.ai/threats/technologies/authpoint-authentication-gateway). Vendors: [Watchguard](https://junglewise.ai/threats/vendors/watchguard).

## Quick answers

**Is CVE-2026-121640 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121640 being exploited in the wild.

**How severe is CVE-2026-121640?** Informational severity, published 4 November 2026.

**Which products and versions are affected?** Watchguard AuthPoint Authentication Gateway before 7.6.0.

**Is there a fix for CVE-2026-121640?** Yes: fixed in AuthPoint Authentication Gateway 7.6.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-121640 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-121640?** Check whether you run Watchguard AuthPoint Authentication Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in AuthPoint Authentication Gateway 7.6.0

## Technical details

This is an authentication bypass vulnerability (CWE-294) exploiting capture-replay weakness in inter-component communication within AuthPoint Gateway. An attacker with network visibility can passively observe legitimate requests between AuthPoint Gateway components, replay them without modification, and gain administrative access to perform unauthorized actions including service disruption. The vulnerability affects versions prior to 7.6.0.

## Affected products

- WatchGuard AuthPoint Authentication Gateway before 7.6.0

## Timeline

- 2026-11-04: disclosed

## References

- [https://psirt.watchguard.com/CVE-2026-121640](https://psirt.watchguard.com/CVE-2026-121640)

## Related threats

- [WatchGuard AuthPoint Gateway authentication bypass](https://junglewise.ai/threats/cve-2026-121639-a-missing-authentication-for-critical-function-vulnerability-in)
- [WatchGuard AuthPoint Gateway improper certificate validation](https://junglewise.ai/threats/cve-2026-121638-an-improper-certificate-validation-vulnerability-in-watchguard)
- [WatchGuard AuthPoint Gateway improper HMAC validation in LDAP authentication](https://junglewise.ai/threats/cve-2026-121637-an-improper-integrity-validation-vulnerability-in-watchguard)
- [WatchGuard AuthPoint Gateway authentication bypass in LDAP Sync](https://junglewise.ai/threats/cve-2026-95676-a-missing-improper-authentication-vulnerability-in-the-watchguard)