CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2021-26085: Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

criticalknown exploitedpublic exploitCVE-2021-26085
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Atlassianproduct: Confluence ServerInformation disclosure
What
Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a pre-authorization arbitrary file read vulnerability.
Who is affected
Users of Atlassian Confluence Server with vulnerable versions.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Atlassian Confluence Server.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Confluence Server

Get an email when a new Confluence Server advisory drops — max one per day, one-click unsubscribe.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-03-28
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-26085

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-26085coverage & exploitation statusNVD · CVE.org

Recent advisories for Atlassian Confluence Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CISA Known Exploited Vulnerabilities