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CVE-2021-26085

MediumPublished

Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

Published: Aug 3, 2021
Updated: Oct 21, 2025
Assigning CNA: atlassian
Evidence observed: Oct 5, 2021

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

99.9%

High · next 30 days

Percentile: 100.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.

Sources

CVE-2021-26085PoC
Atlassian Confluence Server 7.5.1 Pre-Authorization Arbitrary File Read vulnerability (CVE-2021-26085)
Atlassian Confluence 7.12.2 - Pre-Authorization Arbitrary File ReadExploit
Mayank Deshmukh · java · Oct 5, 2021

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