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

5.3MEDIUM

Key Information:

Vendor
Atlassian
Status
Confluence Server
Confluence Data Center
Vendor
CVE Published:
3 August 2021

Badges

💰 Ransomware👾 Exploit Exists🟡 Public PoC🟣 EPSS 95%🦅 CISA Reported

Summary

A vulnerability exists in Atlassian Confluence Server that allows remote attackers to access restricted files via the /s/ endpoint. This Pre-Authorization Arbitrary File Read issue affects versions prior to 7.4.10 as well as versions from 7.5.0 up to (but not including) 7.12.3. Attackers exploiting this vulnerability can potentially expose sensitive information that should remain protected.

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited and is known by the CISA as enabling ransomware campaigns.

The CISA's recommendation is: Apply updates per vendor instructions.

Affected Version(s)

Confluence Data Center < 7.4.10

Confluence Data Center 7.5.0

Confluence Data Center < 7.12.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-26085
Created by ColdFusionX

References

https://jira.atlassian.com/browse/CONFSERVER-67893
x_refsource_MISC
http://packetstormsecurity.com/files/164401/Atlassian-Con...
x_refsource_MISC

EPSS Score

95% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 💰

    Used in Ransomware

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.