CVE-2020-1173Network attack vector

Stored script execution via attachment content-type mismatch

Published May 21, 2020 · Updated Aug 19, 2026

Stored cross-site scripting in Microsoft Power BI Report Server before 1.6.7364.4075 allows remote authenticated users to run scripts. The attachment upload and open path accepts a payload whose declared content type does not match its active content, allowing that content to execute when opened. Exploitation requires authenticated upload access and a user who opens the crafted attachment; the resulting actions occur in that user's security context.

CVSS severity6.8
Medium
EPSS probability2.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Microsoft Power BI Report Server before 1.6.7364.4075 allows remote authenticated users to run scripts. The attachment upload and open path accepts a payload whose declared content type does not match its active content, allowing that content to execute when opened. Exploitation requires authenticated upload access and a user who opens the crafted attachment; the resulting actions occur in that user's security context.

The record

CVE
CVE-2020-1173
Published
May 21, 2020
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Power BI Report Server
Classifications
CWE-20, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2020CVE 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=1.6.0 <1.6.7364.4075

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Power BI Report Serverversion=1.6.0 <1.6.7364.4075

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
6.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/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-20Improper Input Validation
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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