What is CVE-2026-86101?
An improper authorization vulnerability in WatchGuard Fireware OS's SAML login process allows a remote, authenticated SAML user with access only to the Access Portal to obtain unauthorized Mobile VPN with SSL access through a specially crafted request.
The record classifies CVE-2026-86101 under weakness classes CWE-285, CWE-863. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 25 days ago.
Severity and exploitation probability
- CVSS v4.0 base score
- 7.2 — High (derived from score)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:H/SA:N - EPSS (FIRST)
- 0.2% probability of exploitation in the next 30 days, higher than 11.6% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 4.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-09-29, last modified 2026-09-30
Is CVE-2026-86101 being exploited?
It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.
Affected products and versions
- WatchGuard: Fireware OS
How to fix CVE-2026-86101
No vendor patch reference has been recorded for CVE-2026-86101 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-86101
1 tracked threat in the Threadlinqs corpus references CVE-2026-86101, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on .