CVE-2020-1044 json
SQL Server Reporting Services Security Feature Bypass Vulnerability
published 2020-09-11 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-11938
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.0%
- EPSS 2.0% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
<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>
Patch / fix
Exploit prediction
1.96% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C |
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:P/A:N |
Affected products
- Microsoft SQL Server 2017 Reporting Services
- Microsoft SQL Server 2019 Reporting Services
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2020-1044
patch, vendor-advisory
Sources
- CVE List CVE-2020-1044
- NVD CVE-2020-1044
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.