{"id":"CVE-2021-26077","state":"PUBLISHED","title":"Broken Authentication in Atlassian Connect Spring Boot (ACSB) in version 1.1.0 before 2.1.3 and from version 2.1.4 before 2.1.5: Atlassian Connect Spring Boot is a Java Spring Boot","description":"Broken Authentication in Atlassian Connect Spring Boot (ACSB) in version 1.1.0 before 2.1.3 and from version 2.1.4 before 2.1.5: Atlassian Connect Spring Boot is a Java Spring Boot package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Spring Boot app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Spring Boot versions 1.1.0 before 2.1.3 and versions 2.1.4 before 2.1.5 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.","publishedAt":"2021-05-09T23:55:09.616Z","updatedAt":"2025-02-12T20:57:51.249Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","source":"CISA-ADP"},"assigner":"atlassian","products":["Atlassian Atlassian Connect Spring Boot (ACSB)"],"affected":[{"vendor":"Atlassian","product":"Atlassian Connect Spring Boot (ACSB)","versions":[{"version":"1.1.0","status":"affected","lessThan":"unspecified","versionType":"custom"},{"version":"unspecified","status":"affected","lessThan":"2.1.3","versionType":"custom"},{"version":"2.1.4","status":"affected","lessThan":"unspecified","versionType":"custom"},{"version":"unspecified","status":"affected","lessThan":"2.1.5","versionType":"custom"}]}],"references":["https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072","https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147"],"weaknesses":["CWE-287"],"ingestedAt":"2026-10-29T19:48:13.210Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/26xxx/CVE-2021-26077.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-26077","state":"PUBLISHED","datePublished":"2021-05-09T23:55:09.616Z","dateUpdated":"2025-02-12T20:57:51.249Z","assignerShortName":"atlassian","assignerOrgId":"f08a6ab8-ed46-4c22-8884-d911ccfe3c66","dateReserved":"2021-01-25T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"Broken Authentication in Atlassian Connect Spring Boot (ACSB) in version 1.1.0 before 2.1.3 and from version 2.1.4 before 2.1.5: Atlassian Connect Spring Boot is a Java Spring Boot package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Spring Boot app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Spring Boot versions 1.1.0 before 2.1.3 and versions 2.1.4 before 2.1.5 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."}],"affected":[{"vendor":"Atlassian","product":"Atlassian Connect Spring Boot (ACSB)","versions":[{"version":"1.1.0","status":"affected","lessThan":"unspecified","versionType":"custom"},{"version":"unspecified","status":"affected","lessThan":"2.1.3","versionType":"custom"},{"version":"2.1.4","status":"affected","lessThan":"unspecified","versionType":"custom"},{"version":"unspecified","status":"affected","lessThan":"2.1.5","versionType":"custom"}]}],"references":[{"url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072","tags":["x_refsource_MISC"]},{"url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"description":"Broken Authentication","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"atlassian","dateUpdated":"2021-05-09T23:55:09.000Z","orgId":"f08a6ab8-ed46-4c22-8884-d911ccfe3c66"},"datePublic":"2021-05-07T00:00:00.000Z","x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security@atlassian.com","DATE_PUBLIC":"2021-05-07T12:00:00","ID":"CVE-2021-26077","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Atlassian Connect Spring Boot (ACSB)","version":{"version_data":[{"version_affected":">=","version_value":"1.1.0"},{"version_affected":"<","version_value":"2.1.3"},{"version_affected":">=","version_value":"2.1.4"},{"version_affected":"<","version_value":"2.1.5"}]}}]},"vendor_name":"Atlassian"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Broken Authentication in Atlassian Connect Spring Boot (ACSB) in version 1.1.0 before 2.1.3 and from version 2.1.4 before 2.1.5: Atlassian Connect Spring Boot is a Java Spring Boot package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Spring Boot app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Spring Boot versions 1.1.0 before 2.1.3 and versions 2.1.4 before 2.1.5 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":[{"name":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072","refsource":"MISC","url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072"},{"name":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147","refsource":"MISC","url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T20:19:19.375Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":9.1,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-02-12T20:57:46.523916Z","id":"CVE-2021-26077","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-287","type":"CWE","lang":"en","description":"CWE-287 Improper Authentication"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-02-12T20:57:51.249Z"}}]}}}