CVE-2021-26085
Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 18 April 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 99.94% probability · 100th percentile
- Public exploits
- 1 in Exploit-DB · first 5 October 2021
- CISA KEV
- Listed 28 March 2022 · due 18 April 2022 · used in ransomware campaigns
- Weakness
- CWE-425
- Affected
- atlassian/confluence data center · atlassian/confluence server
- Source
- security@atlassian.com
EPSS 99.9% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-26085
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.htmlExploit, Third Party Advisory, VDB Entry
- https://jira.atlassian.com/browse/CONFSERVER-67893Issue Tracking, Vendor Advisory
- http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.htmlExploit, Third Party Advisory, VDB Entry
- https://jira.atlassian.com/browse/CONFSERVER-67893Issue Tracking, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26085US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.