Auth bypass in a widely deployed MFA gateway enabling admin actions and service disruption; impacts identity infrastructure and could cause broad outages.
CVE-2026-121640
Replay authentication bypass in WatchGuard AuthPoint Gateway allowing unauthorized admin actions.
Is CVE-2026-121640 being exploited?
Not confirmed. CVE-2026-121640 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-121640?
CVE-2026-121640 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-121640?
Not known from our data. No patch reference has been recorded for CVE-2026-121640, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-121640 affect?
CVE-2026-121640 affects WatchGuard AuthPoint Gateway. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-121640?
Apply vendor mitigation/patch ASAP, restrict gateway access, rotate credentials, monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Replay-based authentication bypass lets attackers perform unauthorized administrative actions and disrupt authentication/MFA services.
Immediate action required
- affected>= 1.0 and < 7.6.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- partial
Assessed by CISA 4 Nov 2026 (SSVC 2.0.3).
timeline
- 4 Nov 2026Published
- 4 Nov 2026CISA SSVC assessment: exploitation none · same day later
- 4 Nov 2026CVE record last updated · same day later
- 6 Nov 2026Analysed by vulneraibility.com · 2 days later
- Advisorypsirt.watchguard.com /CVE-2026-121640
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.