# CVE-2019-1273: Active Directory Federation Services XSS Vulnerability

CVE-2019-1273 is fixed in 13 products on 1 platform, first by KB4516058, released September 10, 2019. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2019-1273
- Priority: High
- CVSS: 8.2 (Important)
- EPSS: 0.0155
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Sep 10, 2019
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1273

## Description

<p>A cross-site-scripting (XSS) vulnerability exists when Active Directory Federation Services (ADFS) does not properly sanitize certain error messages. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected ADFS server.</p> <p>The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run scripts in the security context of the current user. The attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions on the ADFS site on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user.</p> <p>The security update addresses the vulnerability by helping to ensure that ADFS error handling properly sanitizes error messages.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.1006 | [KB4516058](https://patchblox.com/security/data/fix/microsoft/kb4516058.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.1006 | [KB4516058](https://patchblox.com/security/data/fix/microsoft/kb4516058.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1006 | [KB4516058](https://patchblox.com/security/data/fix/microsoft/kb4516058.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.737 | [KB4512578](https://patchblox.com/security/data/fix/microsoft/kb4512578.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.737 | [KB4512578](https://patchblox.com/security/data/fix/microsoft/kb4512578.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.737 | [KB4512578](https://patchblox.com/security/data/fix/microsoft/kb4512578.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | 18362.356 | [KB4515384](https://patchblox.com/security/data/fix/microsoft/kb4515384.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | 18362.356 | [KB4515384](https://patchblox.com/security/data/fix/microsoft/kb4515384.md) | Sep 10, 2019 |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | 18362.356 | [KB4515384](https://patchblox.com/security/data/fix/microsoft/kb4515384.md) | Sep 10, 2019 |
| Microsoft | Windows Server 2019 | 17763.737 | [KB4512578](https://patchblox.com/security/data/fix/microsoft/kb4512578.md) | Sep 10, 2019 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.737 | [KB4512578](https://patchblox.com/security/data/fix/microsoft/kb4512578.md) | Sep 10, 2019 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.1006 | [KB4516058](https://patchblox.com/security/data/fix/microsoft/kb4516058.md) | Sep 10, 2019 |
| Microsoft | Windows Server, version 1903 (Server Core installation) | 18362.356 | [KB4515384](https://patchblox.com/security/data/fix/microsoft/kb4515384.md) | Sep 10, 2019 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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