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CVE-2021-26859

24
FAUCET Score

CVE-2021-26859 is an information disclosure vulnerability affecting Microsoft Power BI Report Server. With a CVSS score of 7.7 (HIGH), it allows an authenticated attacker to remotely access sensitive information with low attack complexity. While not currently listed in CISA KEV and lacking public exploit code, its FAUCET Risk Score of 64/100 indicates a notable risk. Community discussion and media coverage are limited, with only one article mentioning it as part of Microsoft's March 2021 Patch Tuesday.

Impacted Technologies

VendorProductVersion(s)CPE
15.0.1103.234CPE matchmatch criteria
cpe:2.3:a:microsoft:power_bi_report_server:15.0.1103.234:*:*:*:*:*:*:*
15.0.1104.300CPE matchmatch criteria
cpe:2.3:a:microsoft:power_bi_report_server:15.0.1104.300:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.7HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.1
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.84%
Probability of exploitation in next 30 days
EPSS Percentile
85.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0284 is in the 84th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Power BI Report Server version 15.0.1103.234
View patch
microsoftpatch availablevia msrc
Product: Power BI Report Server version 15.0.1104.300
View patch

Vendor Advisories (1)

microsoft2021-Mar/CVE-2021-26859Important

Microsoft Power BI Information Disclosure Vulnerability

Mar 9, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-26859
PatchVendor Advisory