CVE-2023-21564Network attack vector

Authenticated script execution via reauthentication loading

Published Feb 14, 2023 · Updated Aug 19, 2026

Cross-site scripting in Microsoft Azure DevOps Server 2022 allows remote authenticated users to execute script via reauthentication loading. The reauthentication-loading path permits an XSS vector, but Microsoft has not published the affected function or missing validation or output encoding. An authenticated network request is required; successful exploitation exposes rendered data and permits limited modification in the affected security context.

CVSS severity7.1
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Microsoft Azure DevOps Server 2022 allows remote authenticated users to execute script via reauthentication loading. The reauthentication-loading path permits an XSS vector, but Microsoft has not published the affected function or missing validation or output encoding. An authenticated network request is required; successful exploitation exposes rendered data and permits limited modification in the affected security context.

The record

CVE
CVE-2023-21564
Published
Feb 14, 2023
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Azure DevOps Server
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20230131.0 <20230131.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Azure DevOps Serverversion=20230131.0 <20230131.1

Published CVSS scores

7.1Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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