Vulnerability identifier: #VU57077

Vulnerability risk: Medium

CVSSv3.1: 7.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-26085

CWE-ID: CWE-862

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Atlassian Confluence Server
Server applications / Web servers

Vendor: Atlassian

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to missing authorization in the /s/ endpoint. A remote non-authenticated attacker can send a specially crafted HTTP request to the application and view contents of arbitrary files on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Atlassian Confluence Server: 7.4.0 - 7.4.9, 7.12.0 - 7.12.2, 7.11.0 - 7.11.5, 7.10.0 - 7.10.1, 7.9.0 - 7.9.1, 7.8.0 - 7.8.1, 7.7.2 - 7.7.3, 7.6.0 - 7.6.2, 7.5.0 - 7.5.2

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External links
http://jira.atlassian.com/browse/CONFSERVER-67893
http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.