CVE-2021-26085 is a vulnerability in Atlassian Confluence
Published on August 3, 2021
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.
Known Exploited Vulnerability
This Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. 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 following remediation steps are recommended / required by April 18, 2022: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2021-26085 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is a forced browsing Vulnerability?
The web application does not adequately enforce appropriate authorization on all restricted URLs, scripts, or files. Web applications susceptible to direct request attacks often make the false assumption that such resources can only be reached through a given navigation path and so only apply authorization at certain points in the path.
CVE-2021-26085 has been classified to as a forced browsing vulnerability or weakness.
Products Associated with CVE-2021-26085
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Affected Versions
Atlassian Confluence Server:- Version unspecified and below 7.4.10 is affected.
- Version 7.5.0 and below unspecified is affected.
- Version unspecified and below 7.12.3 is affected.
- Version unspecified and below 7.4.10 is affected.
- Version 7.5.0 and below unspecified is affected.
- Version unspecified and below 7.12.3 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.