CVE-2023-21564
Published: 14 February 2023
Summary
CVE-2023-21564 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Microsoft Azure Devops Server. Its CVSS base score is 7.1 (High).
Operationally, ranked in the top 8.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-21564 is a cross-site scripting vulnerability, tracked as CWE-79, that affects Azure DevOps Server. It received a CVSS 3.1 base score of 7.1 reflecting network attack vector, low complexity, low privileges required, and no user interaction, resulting in high confidentiality impact with limited integrity consequences.
An authenticated attacker with low privileges can send specially crafted requests to the server and achieve script execution in other users' sessions, enabling unauthorized access to sensitive data and limited unauthorized changes within the affected Azure DevOps instance.
Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21564 provides official guidance on mitigation, including the application of security updates released for supported versions of Azure DevOps Server.
The associated EPSS score has remained flat at 0.0637 with no material rise after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25731
Vulnerability details
Azure DevOps Server Cross-Site Scripting Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.