Authorization bypass in Atlassian Confluence Server



Published: 2021-08-03 | Updated: 2021-10-06
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-26085
CWE-ID CWE-862
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
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Atlassian Confluence Server
Server applications / Web servers

Vendor Atlassian

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Missing Authorization

EUVDB-ID: #VU57077

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 - Missing Authorization

Exploit availability: Yes

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 - 7.12.2

External links

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


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.



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