CVE-2021-26084 vulnerability in Atlassian Products
Published on August 30, 2021
Known Exploited Vulnerability
This Atlassian Confluence Server < 6.13.23, 6.14.0 - 7.12.5 Arbitrary Code Execution vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Atlassian Confluence Server 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 contains an OGNL injection vulnerability which allows an attacker to execute arbitrary code.
The following remediation steps are recommended / required by November 17, 2021: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2021-26084 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is an EL Injection Vulnerability?
The software constructs all or part of an expression language (EL) statement in a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.
CVE-2021-26084 has been classified to as an EL Injection vulnerability or weakness.
Products Associated with CVE-2021-26084
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-26084 are published in these products:
Affected Versions
Atlassian Confluence Server:- Version unspecified and below 6.13.23 is affected.
- Version 6.14.0 and below unspecified is affected.
- Version unspecified and below 7.4.11 is affected.
- Version 7.5.0 and below unspecified is affected.
- Version unspecified and below 7.11.6 is affected.
- Version 7.12.0 and below unspecified is affected.
- Version unspecified and below 7.12.5 is affected.
- Version unspecified and below 6.13.23 is affected.
- Version 6.14.0 and below unspecified is affected.
- Version unspecified and below 7.4.11 is affected.
- Version 7.5.0 and below unspecified is affected.
- Version unspecified and below 7.11.6 is affected.
- Version 7.12.0 and below unspecified is affected.
- Version unspecified and below 7.12.5 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.