CVE-2025-49706: Microsoft SharePoint Improper Authentication Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 22 Jul 2025, 14 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 99.1%
EPSS score, percentile 99.9 of all scored records
- How severe?
- 6.5 Medium
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline 23 Jul 2025. Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier … Full text
- Which versions are affected?
Affected
- from 16.0.0 to before 16.0.5508.1000
- from 16.0.0 to before 16.0.10417.20027
- from 16.0.0 to before 16.0.18526.20424
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
CISA due date for this action: 23 July 2025.
Advisories and patches
Linked from CISA's catalog entry
- https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770
- https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706
- https://nvd.nist.gov/vuln/detail/CVE-2025-49706
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 16.0.0 to before 16.0.5508.1000 |
| Status | Versions |
|---|---|
| Affected | from 16.0.0 to before 16.0.10417.20027 |
| Status | Versions |
|---|---|
| Affected | from 16.0.0 to before 16.0.18526.20424 |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Microsoft SharePoint contains an improper authentication vulnerability that allows an authorized attacker to perform spoofing over a network. Successfully exploitation could allow an attacker to view sensitive information and make some changes to disclosed information. This vulnerability could be chained with CVE-2025-49704. CVE-2025-53771 is a patch bypass for CVE-2025-49706, and the updates for CVE-2025-53771 include more robust protection than those for CVE-2025-49706.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2025-49706 to its Known Exploited Vulnerabilities (KEV) catalog on 22 Jul 2025.
- CISA marks it as known to be used in ransomware campaigns.
- The due date CISA sets for the required action is 23 Jul 2025.
- The CVE record was published on 8 Jul 2025, 14 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 6.5 (Medium), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 99.1% (percentile 99.9), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact partial.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
Microsoft SharePoint Server Spoofing Vulnerability
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-287: Improper Authentication
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 8 Jul 2025 | CVE record published |
| 22 Jul 2025 | Added to CISA KEV |
| 23 Jul 2025 | CISA due date for the required action |
| 4 Aug 2026 | CVE record last updated |
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