CVE-2026-26114

HIGH

Microsoft Office SharePoint - Deserialization

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-26114. PoCs published by huynambka.

AI-analyzed exploit summary This repository contains a full-chain exploit for CVE-2026-26114, a SharePoint vulnerability combining a Taxonomy SQL injection primitive with AppLifecycle NDCS deserialization to achieve unauthenticated remote code execution. The exploit leverages blind SQLi in CustomSortOrder to inject rogue AppJobs/AppTasks, then triggers OWSTIMER.EXE to deserialize attacker-controlled TaskData using NetDataContractSerializer.

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Exploits (1)

github WORKING POC
by huynambka · rubypoc
https://github.com/huynambka/cve-2026-26114-poc

This repository contains a full-chain exploit for CVE-2026-26114, a SharePoint vulnerability combining a Taxonomy SQL injection primitive with AppLifecycle NDCS deserialization to achieve unauthenticated remote code execution. The exploit leverages blind SQLi in CustomSortOrder to inject rogue AppJobs/AppTasks, then triggers OWSTIMER.EXE to deserialize attacker-controlled TaskData using NetDataContractSerializer.

Classification
Working Poc 98%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Microsoft SharePoint (2019, Subscription Edition, likely 2016)
Auth required
Prerequisites: NTLM credentials for a SharePoint user with write access to a Managed Metadata group · Network reachability to SharePoint server and attacker-controlled HTTP server · Target must have AppLifecycle timer jobs enabled (default)
mistral-large-3 · analyzed Jul 03, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 8.8
EPSS 0.0303
EPSS Percentile 86.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-502
Status published
Products (4)
Microsoft/Microsoft SharePoint Enterprise Server 2016 16.0.0 - 16.0.5543.1000
Microsoft/Microsoft SharePoint Server 2019 16.0.0 - 16.0.10417.20102
microsoft/sharepoint_server 2016
microsoft/sharepoint_server 2019
Published Mar 10, 2026
Tracked Since Mar 11, 2026