FortiSandbox XSS via web page generation (<=5.0.5, <=4.4.8, all 4.2)
CVE-2026-26248 Published on November 10, 2026
A improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow an unauthenticated attacker to perform an XSS attack via social engineering and crafted HTTP requests.
Vulnerability Analysis
CVE-2026-26248 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-26248 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-26248
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Affected Versions
Fortinet FortiSandbox:- Version 5.0.0, <= 5.0.5 is affected.
- Version 4.4.0, <= 4.4.8 is affected.
- Version 4.2.1, <= 4.2.8 is affected.
- Version 5.0.4, <= 5.0.5 is affected.
- Version 5.0.4, <= 5.0.5 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.