Content-Encoding WAF Evasion
FG-IR-26-157
Summary
CVSSv3 Score:
9.8
An Improper Authentication vulnerability [CWE-287] in the FortiWeb Remote Radius Type Admin Authentication configured with specific, non-default settings may allow a remote unauthenticated attacker to login into the Fortiweb GUI/CLI with a random username and password
Revised on 2026-08-12 00:00:00
Products covered
FortiWeb
Remediation
Separate remediation guidance was not included in the collected bulletin.
CVEs in this advisory 1
Update history
What changed in later vendor updates
SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.
- The vendor changed the advisory summary.
- Severity changed from High to Critical.
- CVSS changed from 8.8 to 9.8.
- Added CVEs: CVE-2026-26035.
Updates
- Published by Fortinet
The publication date reported by the vendor.
- Added to SecurityAlert
We collected the advisory from the official source.
- Confirmed at the source
Our collector saw this advisory during a later source check.