Microsoft SharePoint Server Remote Code Execution Vulnerability
Microsoft · Microsoft SharePoint Enterprise Server 2016
SummaryAI-written · claude-haiku-5-5AI-written · claude-haiku-5-5Written by a language model from the source data on this page. Not reviewed by a person. Generated 23 Oct 2026.
A remote code execution flaw in Microsoft SharePoint Enterprise Server 2016 lies within the SharePoint Server component. An attacker with network access and low-privilege authenticated access can execute code remotely, without any user interaction, to affect confidentiality, integrity and availability.
Heading is the official description · CVE.orgSource dataSource dataCopied from an authoritative feed: NVD, CVE.org, CISA KEV, FIRST EPSS or MITRE CTID mappings, or labelled by the annotators of a published dataset. Copied from CVE.org.
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown.Breakdown
30.9 / 100
Exploited
Not confirmed
Reports
1
Tactics
0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
Disclosed on 11 May 2021. No public exploit code or confirmed exploitation is recorded.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linked
No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
What security researchers reported
Named in 1 threat reportMachineMachine-matchedFound by keyword or pattern matching over threat-report text. Not reviewed by a person. Exact CVE id found in the report text.
1 reportresearch.eye.securityJul 2025
Reports are matched by finding the exact id CVE-2021-28474 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.
Based on us reading about CVE-2021-28474, we learned how the mass exploitation used the ASPX payload to maintain persistence, even after patching: utilizing the way SharePoint handles __VIEWSTATE.