CVE-2023-21806Network attack vector

Authenticated browser script execution via malicious file

Published Feb 14, 2023 · Updated Aug 19, 2026

Cross-site scripting in Microsoft Power BI Report Server before 15.0.1111.115 allows remote authenticated users to run script in a victim's browser. Microsoft has not disclosed which malicious-file field the web server fails to neutralize before generating a page. Exploitation requires low privileges and a victim to execute the file; the script runs in the victim's browser rather than on the server.

CVSS severity8.2
High
EPSS probability0.78%
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 Power BI Report Server before 15.0.1111.115 allows remote authenticated users to run script in a victim's browser. Microsoft has not disclosed which malicious-file field the web server fails to neutralize before generating a page. Exploitation requires low privileges and a victim to execute the file; the script runs in the victim's browser rather than on the server.

The record

CVE
CVE-2023-21806
Published
Feb 14, 2023
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Power BI Report Server
Classifications
CWE-79, T1204.002
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=15.0.0 <1.16.8420.13742

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Power BI Report Serverversion=15.0.0 <1.16.8420.13742

Published CVSS scores

8.2Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1204.002User Execution: Malicious File

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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