CVE-2023-21806
Published: 14 February 2023
Summary
CVE-2023-21806 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Microsoft Power Bi Report Server. Its CVSS base score is 8.2 (High).
Operationally, ranked in the top 20.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-21806 is a spoofing vulnerability affecting Power BI Report Server. It carries a CVSS 3.1 score of 8.2 and is associated with CWE-79, indicating a cross-site scripting or related injection flaw that can be triggered over the network.
An attacker with low privileges can exploit the issue by sending a crafted request that requires user interaction from the victim. Successful exploitation changes security scope and can result in high confidentiality impact along with limited integrity and availability effects, allowing the attacker to spoof content or obtain sensitive data from the affected server.
Microsoft Security Response Center advisories at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21806 provide official guidance on the vulnerability and available updates.
The EPSS score rose materially from a low baseline to a peak of 0.0762 on 2025-01-22 before receding to the current value of 0.0127, indicating that exploitation interest increased after public disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25973
Vulnerability details
Power BI Report Server Spoofing 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.