How severe is CVE-2019-16154?

CVE-2019-16154 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-16154 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16154?

CVE-2019-16154 affects Fortinet Fortiauthenticator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16154?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-16154 published?

CVE-2019-16154 was published on 2020-01-07 and last updated on 2026-06-17.

CVE-2019-16154

CVE-2019-16154 is a medium-severity vulnerability in Fortinet Fortiauthenticator with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fortinet Fortiauthenticator
Published: 2020-01-07
Last modified: 2026-06-17

Description

An improper neutralization of input during web page generation in FortiAuthenticator WEB UI 6.0.0 may allow an unauthenticated user to perform a cross-site scripting attack (XSS) via a parameter of the logon page.

Frequently asked questions

What is CVE-2019-16154?: An improper neutralization of input during web page generation in FortiAuthenticator WEB UI 6.0.0 may allow an unauthenticated user to perform a cross-site scripting attack (XSS) via a parameter of the logon page.
How severe is CVE-2019-16154?: CVE-2019-16154 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-16154 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16154?: CVE-2019-16154 affects Fortinet Fortiauthenticator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16154?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-16154 published?: CVE-2019-16154 was published on 2020-01-07 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-19-104

Affected products (1)

cpe:2.3:a:fortinet:fortiauthenticator:6.0.0:*:*:*:*:*:*:*

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