CVE-2021-26084In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated…
- 9.8CriticalCVSS base score
- 100.0%Exploitation in 30 daysEPSS · top 0.1% of all CVEs
- YesKnown exploitedin CISA's KEV since 3 Nov 2021
- 3Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability.
- Added
- 3 Nov 2021
- Fix due (US federal)
- 17 Nov 2021
- Used by ransomware
- Known
Apply updates per vendor instructions.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 3 Nov 2021.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module, a Nuclei template and an Exploit-DB entry for it. CISA's SSVC rates its exploitation: it is being exploited.
Show the exploits3
Metasploit modules1 module
- Atlassian Confluence WebWork OGNL Injection (Metasploit module) (opens in a new tab)
exploit/multi/http/atlassian_confluence_webwork_ognl_injectionRank excellentdisclosed 25 Aug 2021
Nuclei templates1 template
- Confluence Server - Remote Code Execution (Nuclei template) (opens in a new tab)
http/cves/2021/CVE-2021-26084.yamlSeverity critical
Exploit-DB1 entry
- Confluence Server 7.12.4 - 'OGNL injection' Remote Code Execution (RCE) (Unauthenticated) (Exploit-DB entry) (opens in a new tab)
EDB-ID 50243webapps, javapublished 1 Sept 2021Not verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By atlassian
- 7 months later
· 7 months later
Published
- 2 months later
· 2 months later
Added to CISA KEV
Known exploited, also by ransomware
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 100.0% · top 0.1% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected unspecified – < 6.13.23
- affected 6.14.0 – < unspecified
- affected unspecified – < 7.4.11
- affected 7.5.0 – < unspecified
- affected unspecified – < 7.11.6
- affected 7.12.0 – < unspecified
- affected unspecified – < 7.12.5
Atlassian · Confluence Data Center
- affected unspecified – < 6.13.23
- affected 6.14.0 – < unspecified
- affected unspecified – < 7.4.11
- affected 7.5.0 – < unspecified
- affected unspecified – < 7.11.6
- affected 7.12.0 – < unspecified
- affected unspecified – < 7.12.5
References
References3
- https://jira.atlassian.com/browse/CONFSERVER-67940 (opens in a new tab)x_refsource_MISCx_transferred
- http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26084 (opens in a new tab)government-resource
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-12905 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-26084)Record last updated .