CVE-2026-50522
Microsoft SharePoint Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft SharePoint Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-50522- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-502
- Updated
- 2026-11-02
EUVDEUVD-2026-43767
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-43767- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-ww8x-9jc5-9v7f
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker...
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
- Record
GHSA-ww8x-9jc5-9v7f- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
CISA KEV No score
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
Microsoft SharePoint contains a deserialization of untrusted data vulnerability which could allow an unauthorized attacker to execute code over a network.
- Record
CVE-2026-50522- Weakness
- CWE-502
- Updated
- 2026-11-02
NVD
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-50522- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | HORKimhab/CVE-2026-50522 | 2026-07-22 |
| PoC in GitHub | 4minx/CVE-2026-50522 | 2026-07-25 |
| PoC in GitHub | WismanSec/sharepoint-2026-poc | 2026-07-26 |
| PoC in GitHub | ChPratik/CVE-2026-50522 | 2026-07-27 |
| PoC in GitHub | darses/CVE-2026-50522 | 2026-07-28 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation, exploits | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-50522 is a critical vulnerability (CVSS 9.8) in Microsoft Sharepoint, published July 14, 2026. CISA lists it as known to be exploited, since July 22, 2026. EUVD reports exploitation since July 22, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 3.04%, the 87th percentile. No source names a fixed version.