An improper neutralization of input during web page generation in FortiWeb GUI interface 6.3.0 through 6.3.7 and version before 6.2.4 may a…

published 2021-02-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9278

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 10.5%; EPSS 10.5% chance of exploitation in 30 days, percentile 95%
public exploits: 0; none known, plus a Nuclei check

An improper neutralization of input during web page generation in FortiWeb GUI interface 6.3.0 through 6.3.7 and version before 6.2.4 may allow an unauthenticated, remote attacker to perform a reflected cross site scripting attack (XSS) by injecting malicious payload in different vulnerable API end-points.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-10-23)

Exploit prediction

10.52% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template FortiWeb - Cross Site Scripting nuclei detection template

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

Fortinet Fortinet FortiWeb

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

Technology feeds

Fortinet rss critical rss

References

fortiguard.com /advisory/FG-IR-20-122
vendor-advisory

Sources

CVE List CVE-2021-22122
NVD CVE-2021-22122

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary