How severe is CVE-2018-16794?

CVE-2018-16794 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-16794 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-16794?

CVE-2018-16794 affects Microsoft Active Directory Federation Services. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-16794?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-16794 published?

CVE-2018-16794 was published on 2018-09-18 and last updated on 2026-06-17.

CVE-2018-16794

CVE-2018-16794 is a high-severity vulnerability in Microsoft Active Directory Federation Services with a CVSS 3.x base score of 8.6. 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-918.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 5.0
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Microsoft Active Directory Federation Services
Published: 2018-09-18
Last modified: 2026-06-17

Description

Microsoft ADFS 4.0 Windows Server 2016 and previous (Active Directory Federation Services) has an SSRF vulnerability via the txtBoxEmail parameter in /adfs/ls.

Frequently asked questions

What is CVE-2018-16794?: Microsoft ADFS 4.0 Windows Server 2016 and previous (Active Directory Federation Services) has an SSRF vulnerability via the txtBoxEmail parameter in /adfs/ls.
How severe is CVE-2018-16794?: CVE-2018-16794 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-16794 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-16794?: CVE-2018-16794 affects Microsoft Active Directory Federation Services. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-16794?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-16794 published?: CVE-2018-16794 was published on 2018-09-18 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Microsoft Active Directory Federation Services

CVE-2014-6331 — Medium (CVSS 5.0): Microsoft Active Directory Federation Services (AD FS) 2.0, 2.1, and 3.0, when a configured SAML Relying Party lacks a…
CVE-2013-3185 — Medium (CVSS 5.0): Microsoft Active Directory Federation Services (AD FS) 1.x through 2.1 on Windows Server 2003 R2 SP2, Windows Server…
CVE-2015-1757 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in adfs/ls in Active Directory Federation Services (AD FS) in Microsoft…

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