CVE-2025-49706
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Medium
Known exploited
- Severity
- 6.5 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 99.06%
- Chance of exploitation in the next 30 days. Higher than 99.93% of scored vulnerabilities.
- Known exploited
- Yes
- In CISA's catalog since Jul 22, 2025
- Weakness
- CWE-287 Improper Authentication
- Fix
- None yet
- No fixed version published
Exploited in the wild. Microsoft SharePoint Improper Authentication Vulnerability (Microsoft SharePoint). Required action: 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. Due for U.S. federal agencies by Jul 23, 2025. Known to be used in ransomware campaigns.
Description
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
How to fix
No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.
Severity breakdown
CVSS 3.1 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Weakness
CWE-287: Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
How to prevent it
- Architecture and Design: Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
References
Advisories
Other links
Timeline
- Published
- Added to CISA's Known Exploited Vulnerabilities catalog
- Remediation due for U.S. federal agencies
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-f9x3-7vq9-cph6 Laravel TokenGuard authentication bypass through non-string API credentials | Critical | Same weakness, CWE-287 |
| GHSA-r4xp-prcw-77qf better-auth: OAuth Proxy lets an attacker sign in as another user | Critical | Same weakness, CWE-287 |
| GHSA-965c-763c-88jm better-auth: OAuth state can be used as a Magic Link to sign in as another user | Critical | Same weakness, CWE-287 |
| GO-2026-6773 Nginx UI: Casdoor SSO callback uses a constant `state` parameter (login CSRF) | High | Same weakness, CWE-287 |
| GO-2026-6786 Nginx UI: TOTP / passkey enrolment requires no re-authentication, enabling persistent account takeover | High | Same weakness, CWE-287 |
| GHSA-xv7q-fvmc-jx96 Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover | High | Same weakness, CWE-287 |
| GHSA-68w4-83fh-f2w8 pyload-ng: getUserData/get_userdata exposed at Perms.ANY allow any authenticated account to brute-force the administrator password | High | Same weakness, CWE-287 |
| GHSA-r44w-v6gf-x3p6 pyLoad has an authentication bypass in API key validation (check_apikey cache) | High | Same weakness, CWE-287 |
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