CVE-2021-26073

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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."}, {"lang": "es", "value": "Autenticaci\u00f3n rota en Atlassian Connect Express (ACE) desde la versi\u00f3n 3.0.2 versiones anteriores a 6.6.0: Atlassian Connect Express es un paquete Node.js para construir aplicaciones de Atlassian Connect. La autenticaci\u00f3n entre los productos de Atlassian y la aplicaci\u00f3n Atlassian Connect Express se produce con un JWT de servidor a servidor o un JWT de contexto. Las versiones de Atlassian Connect Express desde la 3.0.2 versiones anteriores a 6.6.0 aceptan err\u00f3neamente JWTs de contexto en los puntos finales del ciclo de vida (como la instalaci\u00f3n) cuando solo deber\u00edan aceptarse JWTs de servidor a servidor, lo que permite a un atacante enviar eventos de reinstalaci\u00f3n autenticados a una aplicaci\u00f3n"}], "id": "CVE-2021-26073", "lastModified": "2026-06-17T03:42:48.113", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.0, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 4.0, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-26073", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-02-12T20:41:50.927822Z", "version": "2.0.3"}}]}, "published": "2021-04-16T03:15:12.033", "references": [{"source": "security@atlassian.com", "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"}, {"source": "security@atlassian.com", "tags": ["Vendor Advisory"], "url": "https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099"}, {"source": "security@atlassian.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20210604-0004/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "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"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20210604-0004/"}], "sourceIdentifier": "security@atlassian.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-287"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

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