CVE-2020-1523 Microsoft SharePoint Server Tampering Vulnerability
Authenticated attackers can modify other users' profile data in Microsoft SharePoint Server due to improper handling of profile information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-1523?
CVE-2020-1523 is a high-severity missing authorization vulnerability in Microsoft Sharepoint Server, published on 11 Sep 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
<p>A tampering vulnerability exists when Microsoft SharePoint Server fails to properly handle profile data. An attacker who successfully exploited this vulnerability could modify a targeted user's profile data.</p> <p>To exploit the vulnerability, an attacker would need to be authenticated on an affected SharePoint Server. The attacker would then need to send a specially modified request to the server, targeting a specific user.</p> <p>The security update addresses the vulnerability by modifying how Microsoft SharePoint Server handles profile data.</p>
Which versions are affected by CVE-2020-1523?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2020-1523?
No fix has been published for CVE-2020-1523 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2020-1523 being exploited?
There is no known exploitation of CVE-2020-1523 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sharepoint Server
- CVE-2026-50522 Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
- CVE-2026-58644 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2026-20963 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2025-53770 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2023-29357 Microsoft SharePoint Server Privilege Escalation
Sources
Also known as GHSA-6vqx-2465-vx69.