How severe is CVE-2020-1173?

CVE-2020-1173 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-1173 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-1173?

CVE-2020-1173 affects Microsoft Power Bi Report Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-1173?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-1173 published?

CVE-2020-1173 was published on 2020-05-21 and last updated on 2026-08-19.

CVE-2020-1173

CVE-2020-1173 is a medium-severity vulnerability in Microsoft Power Bi Report Server with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 3.5
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Microsoft Power Bi Report Server
Published: 2020-05-21
Last modified: 2026-08-19

Description

A spoofing vulnerability exists in Microsoft Power BI Report Server in the way it validates the content-type of uploaded attachments. An authenticated attacker could exploit the vulnerability by uploading a specially crafted payload and sending it to the user. The attacker who successfully exploited this vulnerability could then perform actions and run scripts in the security context of the user. This security update addresses the vulnerability by ensuring Power BI Report Server properly validates content-type of the attachments when uploading and opening.

Frequently asked questions

What is CVE-2020-1173?: A spoofing vulnerability exists in Microsoft Power BI Report Server in the way it validates the content-type of uploaded attachments. An authenticated attacker could exploit the vulnerability by uploading a specially crafted payload and sending it to the user. The attacker who successfully exploited this vulnerability could then perform actions and run scripts in the security context of the user. This security update addresses the vulnerability by ensuring Power BI Report Server properly validates content-type of the attachments when uploading and opening.
How severe is CVE-2020-1173?: CVE-2020-1173 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-1173 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-1173?: CVE-2020-1173 affects Microsoft Power Bi Report Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-1173?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-1173 published?: CVE-2020-1173 was published on 2020-05-21 and last updated on 2026-08-19.

References

Affected products (1)

cpe:2.3:a:microsoft:power_bi_report_server:-:*:*:*:*:*:*:*

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