CVE-2026-70306
Microsoft Office SharePoint Spoofing Vulnerability
No known exploitation. EPSS puts it in the 62nd percentile. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- Microsoft SharePoint Enterprise Server 2016Affected: ≥ 16.0.0, < 16.0.5565.1001Upgrade to: 16.0.5565.1001Stated by: CVE record
- Microsoft SharePoint Server 2019Affected: ≥ 16.0.0, < 16.0.10417.20198Upgrade to: 16.0.10417.20198Stated by: CVE record
- Microsoft SharePoint Server Subscription EditionAffected: ≥ 16.0.0, < 16.0.19725.20522Upgrade to: 16.0.19725.20522Stated by: CVE record
- Microsoft Sharepoint ServerAffected: < 16.0.19725.20434Upgrade to: 16.0.19725.20434Stated by: NVD
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
1.0% chance of exploitation activity in the next 30 days, which ranks it in the 62nd percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
9 events over 26 days, from the signal feeds we watch.
- Patch availablerecord updated
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped, record updated
- OpenVAS check added
Affected products
- sharepoint serverEnterprise Software / collaboration-groupware
- Microsoft SharePoint Enterprise Server 2016Enterprise Software / itsm-monitoring
- Microsoft SharePoint Server 2019Enterprise Software / itsm-monitoring
- Microsoft SharePoint Server Subscription EditionEnterprise Software / collaboration-groupware
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Scored 9.3 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction RequiredA user must click a link, open a file, or perform some action
Scope
- Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability NoneNo availability impact
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
Watch the software you run.
My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.
We'll flag the next CVE, public exploit or patch for Sharepoint Server, not every advisory.
A free account adds
- The full version matrix and every affected product
- Exploit links, proofs of concept and Metasploit modules
- Email alerts for the products you watch
- The same data over REST API, MCP and CLI