How severe is CVE-2018-8891?

CVE-2018-8891 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-8891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-8891?

CVE-2018-8891 affects Blackberry Unified Endpoint Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-8891?

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

When was CVE-2018-8891 published?

CVE-2018-8891 was published on 2018-12-20 and last updated on 2026-06-17.

CVE-2018-8891

CVE-2018-8891 is a medium-severity vulnerability in Blackberry Unified Endpoint Manager with a CVSS 3.x base score of 4.8. 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 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Blackberry Unified Endpoint Manager
Published: 2018-12-20
Last modified: 2026-06-17

Description

Multiple stored cross-site scripting (XSS) vulnerabilities in the Management Console of BlackBerry UEM versions earlier than 12.9.1 could allow an attacker to store script commands that could later be executed in the context of another Management Console administrator.

Frequently asked questions

What is CVE-2018-8891?: Multiple stored cross-site scripting (XSS) vulnerabilities in the Management Console of BlackBerry UEM versions earlier than 12.9.1 could allow an attacker to store script commands that could later be executed in the context of another Management Console administrator.
How severe is CVE-2018-8891?: CVE-2018-8891 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-8891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-8891?: CVE-2018-8891 affects Blackberry Unified Endpoint Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-8891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-8891 published?: CVE-2018-8891 was published on 2018-12-20 and last updated on 2026-06-17.

References

http://support.blackberry.com/kb/articleDetail?articleNumber=000054162

Affected products (1)

cpe:2.3:a:blackberry:unified_endpoint_manager:*:*:*:*:*:*:*:*

More vulnerabilities in Blackberry Unified Endpoint Manager

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CVE-2017-17442 — Medium (CVSS 6.1): In BlackBerry UEM Management Console version 12.7.1 and earlier, a reflected cross-site scripting vulnerability that…
CVE-2017-3894 — Medium (CVSS 6.1): A stored cross site scripting vulnerability in the Management Console of BlackBerry Unified Endpoint Manager version…
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CVE-2018-8888 — Medium (CVSS 4.8): A stored cross-site scripting (XSS) vulnerability in the Management Console of BlackBerry UEM versions earlier than…

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