How severe is CVE-2018-8326?

CVE-2018-8326 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-8326 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-8326?

CVE-2018-8326 affects Microsoft Web Customizations. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-8326?

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

When was CVE-2018-8326 published?

CVE-2018-8326 was published on 2018-07-11 and last updated on 2026-06-17.

CVE-2018-8326

CVE-2018-8326 is a medium-severity vulnerability in Microsoft Web Customizations with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Microsoft Web Customizations
Published: 2018-07-11
Last modified: 2026-06-17

Description

A cross-site-scripting (XSS) vulnerability exists when an open source customization for Microsoft Active Directory Federation Services (AD FS) does not properly sanitize a specially crafted web request to an affected AD FS server, aka "Open Source Customization for Active Directory Federation Services XSS Vulnerability." This affects Web Customizations.

Frequently asked questions

What is CVE-2018-8326?: A cross-site-scripting (XSS) vulnerability exists when an open source customization for Microsoft Active Directory Federation Services (AD FS) does not properly sanitize a specially crafted web request to an affected AD FS server, aka "Open Source Customization for Active Directory Federation Services XSS Vulnerability." This affects Web Customizations.
How severe is CVE-2018-8326?: CVE-2018-8326 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-8326 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-8326?: CVE-2018-8326 affects Microsoft Web Customizations. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-8326?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-8326 published?: CVE-2018-8326 was published on 2018-07-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:web_customizations:*:*:*:*:*:active_directory_federation_services:*:*

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