What’s Vulnerable › Vulnerabilities

CVE-2020-1044: SQL Server Reporting Services Security Feature Bypass Vulnerability

• Severity: medium (CVSS 4.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-11 · updated 2026-06-17
• Weakness: CWE-20

Description

<p>A security feature bypass vulnerability exists in SQL Server Reporting Services (SSRS) when the server improperly validates attachments uploaded to reports. An attacker who successfully exploited this vulnerability could upload file types that were disallowed by an administrator.</p> <p>To exploit the vulnerability, an authenticated attacker would need to send a specially crafted request to an affected SSRS server.</p> <p>The update addresses the vulnerability by modifying how SSRS validates attachment uploads.</p>

Affected products

• Microsoft Sql Server Reporting Services: 2017, 2019
• Microsoft SQL Server 2017 Reporting Services: from 14.0.0 before publication — fixed in publication
• Microsoft SQL Server 2019 Reporting Services: from 15.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft SQL Server 2017 Reporting Services publication; Microsoft SQL Server 2019 Reporting Services publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1044
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1044

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