CVE-2021-26092
Failure to sanitize input in the SSL VPN web portal of FortiOS 5.2.10 through 5.2.15, 5.4.0 through 5.4.13, 5.6.0 through 5.6.14, 6.0.0 through 6.0.12, 6.2.0 through 6.2.7, 6.4.0 through 6.4.4; and FortiProxy 1.2.0 through 1.2.9, 2.0.0 through 2.0.1 may allow a remote unauthenticated attacker to perform a reflected Cross-site Scripting (XSS) attack by sending a request to the error page with malicious GET parameters.
Key facts
- CVSS score
- 4.7 (v3.1)
- Severity
- MEDIUM
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N- Weakness (CWE)
- CWE-79
- EPSS score
- 1.1% (64th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2021-12913)
- Published
- February 24, 2022
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2021-12913 in the EU Vulnerability Database. Last updated in EUVD on October 22, 2024.
View on the EU Vulnerability DatabaseAffected products
- fortinet / fortios
- fortinet / fortiproxy
- fortinet / fortiproxy
- fortinet / fortiproxy
Certified products that may be affected
3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- FortiGate/FortiOS Version 6.2.7 - Fortinet, Inc. - Common Criteria 559-LSS - archived
- FortiOS 5.6 - Fortinet, Inc. - FIPS 140 3639 - historical
- FortiOS 5.2 - Fortinet, Inc. - FIPS 140 2765 - historical
References
- https://fortiguard.com/psirt/FG-IR-20-199(Vendor Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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