Atlassian · Confluence Server and Data Center
CVE-2021-26084
Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability
What it is
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.
CISA: Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: November 17, 2021
More exploited flaws from Atlassian
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Nov 3, 2021 | Path Traversal | Confluence Server and Data Center | High 8.8 | 97% |
| Oct 15, 2026 | Files or Directories Accessible to External Parties | Multiple Products | Critical 9.3 | 99.5% |
| Nov 12, 2024 | Path Traversal | Jira Server and Data Center | Medium 5.3 | >99.9% |
| Jan 24, 2024 | Template Injection | Confluence Data Center and Server | Critical 10.0 | >99.9% |
| Nov 7, 2023 | Improper Authorization | Confluence Data Center and Server | Critical 10.0 | >99.9% |
| Oct 5, 2023 | Broken Access Control | Confluence Data Center and Server | Critical 10.0 | 99.2% |
| Sep 30, 2022 | Command Injection | Bitbucket Server and Data Center | High 8.8 | 99.1% |
| Jul 29, 2022 | Questions For Confluence App Hard-coded Credentials | Confluence | Critical 9.8 | 98% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.