What is CVE-2023-21564?

CVE-2023-21564 is a high-severity vulnerability in Microsoft Azure Devops Server, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2023-02-14.

How severe is CVE-2023-21564?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Microsoft Azure Devops Server

CVE-2023-21564

Azure DevOps Server Cross-Site Scripting Vulnerability

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-02-14 · last modified 2026-08-19.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Microsoft Azure Devops Server — versions 2022
Microsoft Azure Devops Server 2022 — versions 20230131.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21564 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-21564?: CVE-2023-21564 is a high-severity vulnerability in Microsoft Azure Devops Server, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2023-02-14.
How severe is CVE-2023-21564?: High severity. CVSS v3 base score is 7.1 out of 10.