Medium 5.3Known exploited (CISA KEV)Published Aug 2, 2021

CVE-2021-26085Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint.

Updated under an hour ago (Oct 27, 2026, 6:10 AM ET)

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It affects Atlassian Confluence Server and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 28, 2022; federal agencies had to remediate by Apr 18, 2022, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for Atlassian Confluence Server

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-425
Known exploited: Added to CISA KEV Mar 28, 2022; federal remediation due Apr 18, 2022; known ransomware useApply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 99.94% (percentile 100)
Assigned by: atlassian
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Atlassian Confluence Server atlassian:confluence_server (from the name)	from unspecified before 7.4.10; from 7.5.0 before unspecified; from unspecified before 7.12.3	CNA record
Atlassian Confluence Data Center atlassian:confluence_data_center (from the name)	from unspecified before 7.4.10; from 7.5.0 before unspecified; from unspecified before 7.12.3	CNA record
atlassian confluence_data_center atlassian:confluence_data_center	before 7.4.10; from 7.5.0 before 7.12.3	NVD
atlassian confluence_server atlassian:confluence_server	before 7.4.10; from 7.5.0 before 7.12.3	NVD

References

References

https://jira.atlassian.com/browse/CONFSERVER-67893	x-refsource-misc, issue-tracking, vendor-advisory
http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.html	x-refsource-misc, exploit, third-party-advisory, vdb-entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26085	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.