Microsoft ADFS 4.0 Windows Server 2016 and previous (Active Directory Federation Services) has an SSRF vulnerability via the txtBoxEmail pa…

published 2018-09-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8594

cvss: 8.6; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 8.0%; EPSS 8.0% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

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

Exploit prediction

8.03% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

seclists.org http://seclists.org/fulldisclosure/2018/Sep/13 referenced PoC, tagged "exploit" by a source, unverified
packetstormsecurity.com http://packetstormsecurity.com/files/149376/Microsoft-ADFS-4.0-Windows-Server-2016-Server-Side-Request-Forgery.html referenced PoC, tagged "exploit" by a source, unverified
seclists.org https://seclists.org/bugtraq/2018/Sep/26 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.6	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

seclists.org /fulldisclosure/2018/Sep/13
mailing-list, exploit, third-party-advisory
packetstormsecurity.com /files/149376/Microsoft-ADFS-4.0-Windows-Server-2016-Server-Side-Request-Forgery.html
exploit, third-party-advisory, vdb-entry
seclists.org /bugtraq/2018/Sep/26
mailing-list, exploit, third-party-advisory
securityfocus.com /bid/105378
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-16794
NVD CVE-2018-16794

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary