Authenticated code execution via unchecked generic arguments
Published Jul 11, 2023 · Updated Feb 28, 2025
Deserialization in Microsoft SharePoint Server allows remote authenticated users to execute arbitrary code through crafted ASPX page content. SPPageParserFilter accepts a safe generic control without recursively checking its attacker-chosen type arguments against the Safe Controls list. A valid SharePoint account able to create or upload a custom ASPX page can use a null-terminated type name to invoke an unsafe property converter in the web process.
Summary
What happened
Deserialization in Microsoft SharePoint Server allows remote authenticated users to execute arbitrary code through crafted ASPX page content. SPPageParserFilter accepts a safe generic control without recursively checking its attacker-chosen type arguments against the Safe Controls list. A valid SharePoint account able to create or upload a custom ASPX page can use a null-terminated type name to invoke an unsafe property converter in the web process.
The record
- CVE
- CVE-2023-33160
- Published
- Jul 11, 2023
- Updated
- Feb 28, 2025
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Enterprise Server 2016
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 11, 2023CVE publishedPublication date reported by the CVE source.
- Feb 28, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.0.5404.1000
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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