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CVE-2021-26084

UNKNOWN
Published 2021-08-30T06:30:14.248Z
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CVSS Score

V3.1
9.8
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.944
probability
of exploitation in the wild

There is a 94.4% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 1.000
Higher than 100.0% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Description

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.

Available Exploits

Confluence Server - Remote Code Execution

Confluence Server and Data Center contain an OGNL injection vulnerability that could allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if 'Allow people to sign up to create their account' is enabled. To check whether this is enabled go to COG > User Management > User Signup Options.

ID: CVE-2021-26084
Author: dhiyaneshDkphilippedelteil Critical

References:

Related News

No news articles found for this CVE.

Affected Products

Atlassian

Confluence Server

Affected Versions:

unspecified 6.14.0 unspecified 7.5.0 unspecified 7.12.0 unspecified
Atlassian

Confluence Data Center

Affected Versions:

unspecified 6.14.0 unspecified 7.5.0 unspecified 7.12.0 unspecified

Known Exploited Vulnerability

This vulnerability is actively being exploited in the wild

View KEV Details

Remediation Status

Overdue

Due Date

November 17, 2021

Added to KEV

November 3, 2021

Required Action

Apply updates per vendor instructions.

Affected Product

Vendor/Project: Atlassian
Product: Confluence Server and Data Center

Ransomware Risk

Known Ransomware Use
KEV Catalog Version: 2025.01.24 Released: January 24, 2025

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed CRITICAL

GHSA-855c-xp53-5fp2

Advisory Details

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if ‘Allow people to sign up to create their account’ is enabled. To check whether this is enabled go to COG > User Management > User Signup Options. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.

CVSS Scoring

CVSS Score

9.0

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-26084
WEB https://jira.atlassian.com/browse/CONFSERVER-67940
WEB http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html
WEB http://packetstormsecurity.com/files/164122/Atlassian-Confluence-WebWork-OGNL-Injection.html
WEB http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html

Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: February 4, 2025

References

https://jira.atlassian.com/browse/CONFSERVER-67940
http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html

HackerOne Reports

RCE on ███████ [CVE-2021-26084] Critical
fdeleite
U.S. Dept Of Defense
OS Command Injection
View Report
RCE in ███ [CVE-2021-26084] Critical
fdeleite
U.S. Dept Of Defense
OS Command Injection
View Report
Published: 2021-08-30T06:30:14.248Z
Last Modified: 2025-02-04T14:48:39.312Z
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