{"answers":{"affected":"It affects 2 products.","exploited":"Yes. Attackers have exploited CVE-2021-26084 in the wild since at least 3 Nov 2021, including in ransomware campaigns.","fix":"No fix has been published for CVE-2021-26084 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.","what":"CVE-2021-26084 is a critical code injection vulnerability in Atlassian Confluence Data Center, published on 30 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-26084 and fix it if it is affected.\n\nWhat it is: CVE-2021-26084 is a critical code injection vulnerability in Atlassian Confluence Data Center, published on 30 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2021-26084 in the wild since at least 3 Nov 2021, including in ransomware campaigns.\n\nAffected product: Atlassian Confluence Data Center. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-26084/ (Markdown: https://insights.sbomify.com/CVE-2021-26084/index.md)","id":"CVE-2021-26084","markdown":"https://insights.sbomify.com/CVE-2021-26084/index.md","name":"CVE-2021-26084","record":{"aliases":["GHSA-855c-xp53-5fp2"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Confluence Server","requires_auth":"none","summary":"Unauthenticated attackers can execute arbitrary code on Confluence Server or Data Center instances via OGNL injection.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"atlassian","cpe":[{"product":"confluence_data_center","vendor":"atlassian"},{"product":"confluence_server","vendor":"atlassian"}],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-917","name":"Improper Neutralization of Special Elements used in an Expression Language Statement"}],"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.","ecosystems":[],"exploits":{"exploitdb":1,"first_seen":"2021-08-25","github_poc":35,"max_poc_stars":316,"metasploit":1,"nuclei":1,"refs":[{"date":"2021-09-01T07:15:17Z","kind":"github_poc","ref":"https://github.com/hev0x/CVE-2021-26084_Confluence","stars":316,"title":"Confluence Server Webwork OGNL injection"},{"date":"2021-09-01T09:50:26Z","kind":"github_poc","ref":"https://github.com/0xf4n9x/CVE-2021-26084","stars":72,"title":"CVE-2021-26084 Remote Code Execution on Confluence Servers"},{"date":"2021-08-31T23:33:44Z","kind":"github_poc","ref":"https://github.com/alt3kx/CVE-2021-26084_PoC","stars":53,"title":null},{"date":"2021-09-01T00:50:30Z","kind":"github_poc","ref":"https://github.com/dinhbaouit/CVE-2021-26084","stars":53,"title":null},{"date":"2021-09-07T01:15:16Z","kind":"github_poc","ref":"https://github.com/1ZRR4H/CVE-2021-26084","stars":29,"title":"Atlassian Confluence CVE-2021-26084  one-liner mass checker"},{"date":"2021-08-31T16:33:32Z","kind":"github_poc","ref":"https://github.com/crowsec-edtech/CVE-2021-26084","stars":21,"title":"CVE-2021-26084 - Confluence Pre-Auth RCE | OGNL injection "},{"date":"2022-01-13T06:29:51Z","kind":"github_poc","ref":"https://github.com/ZZ-SOCMAP/CVE-2021-26084","stars":9,"title":"POC of CVE-2021-26084, which is Atlassian Confluence Server OGNL(Object-Graph Navigation Language) Pre-Auth RCE Injection Vulneralibity."},{"date":"2021-09-01T12:19:53Z","kind":"github_poc","ref":"https://github.com/Vulnmachines/Confluence_CVE-2021-26084","stars":8,"title":"Remote Code Execution on Confluence Servers : CVE-2021-26084"}],"tier":"exploited"},"has_fix":null,"headline":"Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection","id":"CVE-2021-26084","indexable":true,"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","knownRansomwareCampaignUse":"Known","product":"Confluence Server and Data Center","requiredAction":"Apply updates per vendor instructions.","vendorProject":"Atlassian","vulnerabilityName":"Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"code_injection","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Atlassian Confluence Server Pre-Authorization Arbitrary File Read","id":"CVE-2021-26085"},"packages":[],"prev":{"headline":"Cross-site scripting in Jira Data Center","id":"CVE-2021-26083"},"products":["Confluence Data Center","Confluence Server"],"published":"2021-08-30","related":[{"cvss_score":10,"headline":"Atlassian Confluence Data Center and Server Template Injection","id":"CVE-2023-22527","kev_date_added":"2024-01-24","published":"2024-01-16"},{"cvss_score":10,"headline":"Atlassian Confluence Data Center and Server Improper Authorization","id":"CVE-2023-22518","kev_date_added":"2023-11-07","published":"2023-10-31"},{"cvss_score":10,"headline":"Atlassian Confluence Data Center and Server Broken Access Control","id":"CVE-2023-22515","kev_date_added":"2023-10-05","published":"2023-10-04"},{"cvss_score":9.8,"headline":"Atlassian Confluence Server and Data Center Remote Code Execution","id":"CVE-2022-26134","kev_date_added":"2022-06-02","published":"2022-06-03"},{"cvss_score":5.3,"headline":"Atlassian Confluence Server Pre-Authorization Arbitrary File Read","id":"CVE-2021-26085","kev_date_added":"2022-03-28","published":"2021-08-03"},{"cvss_score":9,"headline":"Code injection in Confluence Data Center","id":"CVE-2023-22522","kev_date_added":null,"published":"2023-12-06"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-12-16","vendors":["Atlassian"]},"summary":"Unauthenticated attackers can execute arbitrary code on Confluence Server or Data Center instances via OGNL injection.","url":"https://insights.sbomify.com/CVE-2021-26084/"}