What is CVE-2026-121639?
A Missing Authentication for Critical Function vulnerability in WatchGuard AuthPoint Gateway allows a remote unauthenticated attacker with network access to the AuthPoint Gateway host to disrupt authentication services and delete the local directory synchronization configuration.
The record classifies CVE-2026-121639 under weakness classes CWE-252, CWE-287, CWE-306. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 2 days ago.
Severity and exploitation probability
- CVSS v4.0 base score
- 9.2 — Critical (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:H - EPSS (FIRST)
- 0.6% probability of exploitation in the next 30 days, higher than 52.1% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-11-04
Is CVE-2026-121639 being exploited?
It currently carries a trending score of 48 in the Threadlinqs vulnerability feed.
Affected products and versions
- WatchGuard: AuthPoint Authentication Gateway
How to fix CVE-2026-121639
Vendor advisory: https://psirt.watchguard.com/CVE-2026-121639. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-121639
1 tracked threat in the Threadlinqs corpus references CVE-2026-121639, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.