CVE-2025-49706 — Microsoft SharePoint Improper Authentication Vulnerability

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

01What is this vulnerability?

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

02Affected products

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2025-07-22. Ransomware use: Known.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-07-08T16:58:07.343Z
• Last modified: 2026-02-26T18:27:35.104Z
• Added to CISA KEV: 2025-07-22
• BOD 22-01 due: 2025-07-23

09References

• msrc.microsoft.com — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706