Microsoft Office SharePoint Tampering Vulnerability
Published October 13, 2026Updated October 13, 2026
Source data
Overview
Observable discrepancy in Microsoft Office SharePoint allows an authorized attacker to perform tampering over a network.
Impact & technical details
Tampering
How could an attacker exploit this vulnerability? An authenticated attacker with access to an affected SharePoint form could submit specially crafted session data to the server. Successful exploitation could allow the attacker to alter trusted application state and cause unauthorized backend actions; user interaction is not required.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system and the ability to manipulate its components to trigger a specific condition. Successful exploitation is not guaranteed and depends on a combination of factors that may include the environment, system configuration, and the presence of additional security measures.
- CVSS base score
- 6.8 / 10
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.
Affected products
- Microsoft SharePoint Server Subscription Edition
Source guidance
Remediation
The source provides update references without a separate remediation summary. Review the applicable update links below.
Patch availability is not confirmed by this dataset. Consult the vendor before selecting a remediation.
GTP recommendation · Rule-based guidance
Recommended next step
Review affected Microsoft products and apply the applicable security updates through your organization's normal patch-management process. Confirm availability and prerequisites in the Microsoft advisory.
Authoritative sources & updates
Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.
Managed by GTP?
Griffin Technology Partners managed customers may receive additional environment-specific security guidance and remediation assistance through their managed services relationship.
Security bulletins are provided for informational purposes and compiled from authoritative public sources. Vulnerability applicability varies by environment. Validate affected products, configuration, compatibility requirements, and vendor guidance before making production changes.