How severe is CVE-2019-9591?

CVE-2019-9591 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-2019-9591 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9591?

CVE-2019-9591 affects Mitel Connect Onsite. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9591?

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

When was CVE-2019-9591 published?

CVE-2019-9591 was published on 2019-03-06 and last updated on 2026-06-17.

CVE-2019-9591

CVE-2019-9591 is a medium-severity vulnerability in Mitel Connect Onsite 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: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mitel Connect Onsite
Published: 2019-03-06
Last modified: 2026-06-17

Description

A reflected Cross-site scripting (XSS) vulnerability in ShoreTel Connect ONSITE before 19.49.1500.0 allows remote attackers to inject arbitrary web script or HTML via the brandUrl parameter.

Frequently asked questions

What is CVE-2019-9591?: A reflected Cross-site scripting (XSS) vulnerability in ShoreTel Connect ONSITE before 19.49.1500.0 allows remote attackers to inject arbitrary web script or HTML via the brandUrl parameter.
How severe is CVE-2019-9591?: CVE-2019-9591 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-2019-9591 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9591?: CVE-2019-9591 affects Mitel Connect Onsite. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9591?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-9591 published?: CVE-2019-9591 was published on 2019-03-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mitel:connect_onsite:*:*:*:*:*:*:*:*

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