# CVE-2025-49706: Microsoft SharePoint Enterprise Server - Authentication Bypass

> Live exploitation tracking for CVE-2025-49706 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-49706

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 6.5
- **Public exploit available:** Yes
- **Affected products:** Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
- **Weaknesses:** CWE-287 (Improper Authentication)
- **Tags:** enterprise_software

## Description

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

## CrowdSec analysis

[CVE-2025-49706](https://euvd.enisa.europa.eu/vulnerability/CVE-2025-49706) is an improper authentication vulnerability in Microsoft SharePoint, affecting multiple server versions, that allows unauthorized attackers to perform spoofing attacks over a network. Exploiting this flaw could enable threat actors to impersonate legitimate users or services, potentially leading to unauthorized access or manipulation of sensitive information within SharePoint environments.

CrowdSec has been tracking this vulnerability and its exploits since 10th of December 2025.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2025-49706 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting.
Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2025-49706 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2025-49706 is currently experiencing high visibility and active exploitation across the internet.

Attackers exploit authentication bypass by sending crafted POST requests to the `/ _layouts/15/ToolPane.aspx` endpoint with specific query parameters such as `DisplayMode=Edit` and `a=/ToolPane.aspx`, attempting unauthorized access to SharePoint server functions.

## Timeline

- 2025-07-08: CVE Published. CVE-2025-49706 is published to NVD.
- 2025-07-22: CISA KEV. CVE-2025-49706 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2025-07-23: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2025-12-10: Rule Released. CrowdSec releases a rule to detect CVE-2025-49706 exploitation attempts against the CrowdSec Network.
- 2025-12-16: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-49706 for the first time.

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-49706
- https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-49706.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-49706) follows observed exploitation activity for CVE-2025-49706. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.