{"api_version":"1","generated_at":"2026-07-25T05:53:47+00:00","cve":"CVE-2021-26073","urls":{"html":"https://cve.report/CVE-2021-26073","api":"https://cve.report/api/cve/CVE-2021-26073.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-26073","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-26073"},"summary":{"title":"CVE-2021-26073","description":"Broken Authentication in Atlassian Connect Express (ACE) from version 3.0.2 before version 6.6.0: Atlassian Connect Express is a Node.js package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Express app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Express versions from 3.0.2 before 6.6.0 erroneously accept context JWTs in lifecycle endpoints (such as installation) where only server-to-server JWTs should be accepted, permitting an attacker to send authenticated re-installation events to an app.","state":"PUBLIC","assigner":"security@atlassian.com","published_at":"2021-04-16 03:15:00","updated_at":"2023-11-07 03:31:00"},"problem_types":["CWE-287"],"metrics":[],"references":[{"url":"https://security.netapp.com/advisory/ntap-20210604-0004/","name":"https://security.netapp.com/advisory/ntap-20210604-0004/","refsource":"CONFIRM","tags":[],"title":"CVE-2021-26073 Node.JS Vulnerability in NetApp Products | NetApp Product Security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a[…]ypass-of-app-qsh-verification-via-context-jwts/47072","name":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a[…]ypass-of-app-qsh-verification-via-context-jwts/47072","refsource":"MISC","tags":["Broken Link"],"title":"Action required: Atlassian Connect vulnerability allows bypass of app qsh verification via context JWTs - Announcements - The Atlassian Developer Community","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099","name":"N/A","refsource":"N/A","tags":[],"title":"CVE-2020-26073 - Broken authentication in Atlassian Connect Express (ACE) - Security - Atlassian Documentation","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a%5B%E2%80%A6%5Dypass-of-app-qsh-verification-via-context-jwts/47072","name":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a%5B%E2%80%A6%5Dypass-of-app-qsh-verification-via-context-jwts/47072","refsource":"","tags":[],"title":"Action required: Atlassian Connect vulnerability allows bypass of app qsh verification via context JWTs - Announcements - The Atlassian Developer Community","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a%5B%2026%5Dypass-of-app-qsh-verification-via-context-jwts/47072","name":"MISC:https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a[…]ypass-of-app-qsh-verification-via-context-jwts/47072","refsource":"MITRE","tags":[],"title":"Action required: Atlassian Connect vulnerability allows bypass of app qsh verification via context JWTs - Announcements - The Atlassian Developer Community","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-26073","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26073","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"26073","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"atlassian","cpe5":"connect_express","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"node.js","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security@atlassian.com","DATE_PUBLIC":"2021-04-13T00:00:00","ID":"CVE-2021-26073","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Atlassian Connect Express (ACE)","version":{"version_data":[{"version_value":"3.0.2","version_affected":">="},{"version_value":"6.6.0","version_affected":"<"}]}}]},"vendor_name":"Atlassian"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Broken Authentication in Atlassian Connect Express (ACE) from version 3.0.2 before version 6.6.0: Atlassian Connect Express is a Node.js package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Express app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Express versions from 3.0.2 before 6.6.0 erroneously accept context JWTs in lifecycle endpoints (such as installation) where only server-to-server JWTs should be accepted, permitting an attacker to send authenticated re-installation events to an app."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Broken Authentication"}]}]},"references":{"reference_data":[{"url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099","refsource":"MISC","name":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099"},{"url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a[…]ypass-of-app-qsh-verification-via-context-jwts/47072","refsource":"MISC","name":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a[…]ypass-of-app-qsh-verification-via-context-jwts/47072"},{"refsource":"CONFIRM","name":"https://security.netapp.com/advisory/ntap-20210604-0004/","url":"https://security.netapp.com/advisory/ntap-20210604-0004/"}]}},"nvd":{"publishedDate":"2021-04-16 03:15:00","lastModifiedDate":"2023-11-07 03:31:00","problem_types":["CWE-287"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":7.7,"baseSeverity":"HIGH"},"exploitabilityScore":3.1,"impactScore":4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":4},"severity":"MEDIUM","exploitabilityScore":8,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:atlassian:connect_express:*:*:*:*:*:node.js:*:*","versionStartIncluding":"3.0.2","versionEndExcluding":"6.6.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"26073","Ordinal":"201018","Title":"CVE-2021-26073","CVE":"CVE-2021-26073","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"26073","Ordinal":"1","NoteData":"Broken Authentication in Atlassian Connect Express (ACE) from version 3.0.2 before version 6.6.0: Atlassian Connect Express is a Node.js package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Express app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Express versions between 3.0.2 - 6.5.0 erroneously accept context JWTs in lifecycle endpoints (such as installation) where only server-to-server JWTs should be accepted, permitting an attacker to send authenticated re-installation events to an app.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"26073","Ordinal":"2","NoteData":"2021-04-15","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"26073","Ordinal":"3","NoteData":"2021-06-04","Type":"Other","Title":"Modified"}]}}}