How severe is CVE-2019-5586?

CVE-2019-5586 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-2019-5586 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5586?

CVE-2019-5586 affects Fortinet Fortios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-5586?

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

When was CVE-2019-5586 published?

CVE-2019-5586 was published on 2019-06-04 and last updated on 2026-06-17.

CVE-2019-5586

CVE-2019-5586 is a medium-severity vulnerability in Fortinet Fortios 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% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fortinet Fortios
Published: 2019-06-04
Last modified: 2026-06-17

Description

A reflected Cross-Site-Scripting (XSS) vulnerability in Fortinet FortiOS 5.2.0 to 5.6.10, 6.0.0 to 6.0.4 under SSL VPN web portal may allow an attacker to execute unauthorized malicious script code via the "param" parameter of the error process HTTP requests.

Frequently asked questions

What is CVE-2019-5586?: A reflected Cross-Site-Scripting (XSS) vulnerability in Fortinet FortiOS 5.2.0 to 5.6.10, 6.0.0 to 6.0.4 under SSL VPN web portal may allow an attacker to execute unauthorized malicious script code via the "param" parameter of the error process HTTP requests.
How severe is CVE-2019-5586?: CVE-2019-5586 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-2019-5586 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5586?: CVE-2019-5586 affects Fortinet Fortios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-5586?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-5586 published?: CVE-2019-5586 was published on 2019-06-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*

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