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Fencer Vulns
high 8.1

CVE-2021-31950 json

Microsoft SharePoint Server Spoofing Vulnerability

published 2021-06-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18823

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.6%
EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits
1
Exploit-DB

Summary

Microsoft SharePoint Server Spoofing Vulnerability

Patch / fix

  • Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.5173.1000
  • Microsoft Microsoft SharePoint Server 2019 16.0.10375.20000
  • Microsoft Microsoft SharePoint Foundation 2013 Service Pack 1 15.0.5353.1000

Timeline

  1. Published
  2. First public exploit (EDB-49982)

Exploit prediction

4.56% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-49982 Microsoft SharePoint Server 16.0.10372.20060 - 'GetXmlDataFromDataSource' Server-Side Request Forgery (SSRF) webapps, 2021-06-11
  • packetstormsecurity.com http://packetstormsecurity.com/files/163080/Microsoft-SharePoint-Server-16.0.10372.20060-Server-Side-Request-Forgery.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N/E:U/RL:O/RC:C
CNA 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 5.5 AV:N/AC:L/Au:S/C:P/I:P/A:N

Affected products

  • Microsoft Microsoft SharePoint Enterprise Server 2016
  • Microsoft Microsoft SharePoint Server 2019
  • Microsoft Microsoft SharePoint Foundation 2013 Service Pack 1

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

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.