CVE-2021-26084
Last modified
CVE-2021-26084 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 100.00% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
100.0th percentile
Probability of exploitation in the next 30 days. Learn more
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Atlassian | Confluence Data Center | < 6.13.23 |
| Atlassian | Confluence Data Center | >= 6.14.0, < 7.4.11 |
| Atlassian | Confluence Data Center | >= 7.5.0, < 7.11.6 |
| Atlassian | Confluence Data Center | >= 7.12.0, < 7.12.5 |
| Atlassian | Confluence Server | < 6.13.23 |
| Atlassian | Confluence Server | >= 6.14.0, < 7.4.11 |
| Atlassian | Confluence Server | >= 7.5.0, < 7.11.6 |
| Atlassian | Confluence Server | >= 7.12.0, < 7.12.5 |
References
- http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.htmlExploit, Third Party Advisory, VDB Entry
- https://jira.atlassian.com/browse/CONFSERVER-67940Issue Tracking, Patch, Vendor Advisory
- http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.htmlExploit, Third Party Advisory, VDB Entry
- https://jira.atlassian.com/browse/CONFSERVER-67940Issue Tracking, Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26084US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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