How severe is CVE-2021-26859?

CVE-2021-26859 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-26859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26859?

CVE-2021-26859 primarily affects Microsoft Power Bi Report Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26859?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26859 published?

CVE-2021-26859 was published on 2021-03-11 and last updated on 2026-06-17.

CVE-2021-26859

CVE-2021-26859 is a high-severity vulnerability in Microsoft Power Bi Report Server with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v2: 4.0
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Power Bi Report Server
Published: 2021-03-11
Last modified: 2026-06-17

Description

Microsoft Power BI Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2021-26859?: Microsoft Power BI Information Disclosure Vulnerability
How severe is CVE-2021-26859?: CVE-2021-26859 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-26859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26859?: CVE-2021-26859 primarily affects Microsoft Power Bi Report Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26859 published?: CVE-2021-26859 was published on 2021-03-11 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26859

Affected products (2)

cpe:2.3:a:microsoft:power_bi_report_server:15.0.1103.234:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:power_bi_report_server:15.0.1104.300:*:*:*:*:*:*:*

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