Important EPSS 0.01589 2019-08 archive

Executive Summary

An information disclosure vulnerability exists in the way Microsoft SharePoint handles session objects. An authenticated attacker who successfully exploited the vulnerability could hijack the session of another user. To exploit this vulnerability, the attacker could run a specially crafted application. The security update corrects how SharePoint handles session objects to prevent user session hijacking.

Overview

Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Information Disclosure
Released Aug 13 2019
Last Updated Aug 13 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.01589 — 0.72472 percentile

EPSS Score

0.01589
probability of exploitation in the next 30 days
0.72472 percentile - updated 2026-06-20
View on FIRST.org

Affected Products

4 affected products
Product KB Article Severity Impact Restart Required
Microsoft SharePoint Enterprise Server 2016 4475549 (Security Update) Important Information Disclosure Maybe
Microsoft SharePoint Foundation 2010 Service Pack 2 4475575 (Security Update) Important Information Disclosure Maybe
Microsoft SharePoint Foundation 2013 Service Pack 1 4475565 (Security Update) Important Information Disclosure Maybe
Microsoft SharePoint Server 2019 4475555 (Security Update) Important Information Disclosure Maybe

Patches

4 patches
Article Type Restart
4475549 Security Update Maybe
4475575 Security Update Maybe
4475565 Security Update Maybe
4475555 Security Update Maybe

Known Exploits

Acknowledgments

Andrew J. Federico, Jr. , Rochester, NY