# CVE-2025-49706 — Microsoft SharePoint Enterprise Server 2016

**CISA KEV** · **Ransomware**

> As of 2026-08-04, CVE-2025-49706 is a MEDIUM-severity vulnerability in Microsoft SharePoint Enterprise Server 2016, CVSS v3.1 6.5, EPSS 99.0% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-07-22), with a US federal remediation deadline of 2025-07-23, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 4 tracked threat campaigns to CVE-2025-49706, most recently “Warlock Ransomware Attackers Hit Water and Telecom Operators via SharePoint ToolShell Exploitation (Longlegs / Storm-2603)”.

**Last updated:** 2026-08-04

## What is CVE-2025-49706?

Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

The record classifies CVE-2025-49706 under weakness class [CWE-287](https://cwe.mitre.org/data/definitions/287.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 451 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.5 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C`)
- **EPSS (FIRST):** 99.0% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
- **CISA KEV:** Listed since 2025-07-22, federal remediation deadline 2025-07-23 — used in known ransomware campaigns
- **Threadlinqs priority:** 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- **Published:** 2025-07-08, last modified 2026-08-04

## Is CVE-2025-49706 being exploited?

CISA added CVE-2025-49706 to the Known Exploited Vulnerabilities catalog on 2025-07-22, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-07-23 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2025-49706 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (`http/cves/2025/CVE-2025-49706.yaml`). It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.

- [AdityaBhatt3010/CVE-2025-49706-SharePoint-Spoofing-Vulnerability-Under-Active-Exploitation](https://github.com/AdityaBhatt3010/CVE-2025-49706-SharePoint-Spoofing-Vulnerability-Under-Active-Exploitation) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2025/CVE-2025-49706.md) (trickest)

## Affected products and versions

- **Microsoft**: SharePoint Enterprise Server 2016, SharePoint Server 2019, SharePoint Server Subscription Edition

## How to fix CVE-2025-49706

Vendor advisory: [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706). Because CVE-2025-49706 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-07-23. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2025-49706

4 tracked threats in the Threadlinqs corpus reference CVE-2025-49706, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Warlock Ransomware Attackers Hit Water and Telecom Operators via SharePoint ToolShell Exploitation (Longlegs / Storm-2603)](https://intel.threadlinqs.com/threat/TL-2026-2833) — CRITICAL · 2026-10-01
- [CVE-2026-56164: Microsoft SharePoint Server Missing-Authentication Vulnerability Actively Exploited, Added to CISA KEV](https://intel.threadlinqs.com/threat/TL-2026-1369) — CRITICAL · 2026-07-15
- [CVE-2026-45659: SharePoint Deserialization RCE Added to CISA KEV Amid Storm-2603 Exploitation](https://intel.threadlinqs.com/threat/TL-2026-1061) — HIGH · 2026-07-02
- [CVE-2026-45659: Microsoft SharePoint Deserialization RCE Actively Exploited, Added to CISA KEV](https://intel.threadlinqs.com/threat/TL-2026-1068) — HIGH · 2026-07-02

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-02. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706)

Canonical: https://intel.threadlinqs.com/cve/CVE-2025-49706
Full detection coverage and IOCs for threats exploiting CVE-2025-49706 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp