Critical [CVE-2021-26084] In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would
This critical-severity Atlassian advisory covers CVE-2021-26084 affecting Confluence Server.
Android app · Google Play
Monitor future Atlassian CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
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 Known Exploited Vulnerability
- Listed:
- Nov 3, 2021 · federal remediation due Nov 17, 2021
- Required action:
- Apply updates per vendor instructions.
- Ransomware use:
- Known
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- 6.14.0
- 7.5.0
- 7.12.0
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 7.4.11
- 7.11.6
- 7.12.5
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 7.4.11, 7.11.6, 7.12.5. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.