{"cve":{"cve_id":"CVE-2021-26077","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00951,"epss_percentile":0.56663,"epss_as_of":"2026-06-23","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.","published_at":"2021-05-09T23:55:09.616000Z","last_modified_at":null,"cvss_v3_score":9.1,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-287"],"nvd_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"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:15:17.887649Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"atlassian-connect-spring-boot-acsb","product_name":"Atlassian Connect Spring Boot (ACSB)","version_start":"1.1.0","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:atlassian-connect-spring-boot-acsb:1.1.0:unspecified"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"atlassian-connect-spring-boot-acsb","product_name":"Atlassian Connect Spring Boot (ACSB)","version_start":"unspecified","version_start_inclusive":true,"version_end":"2.1.3","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:atlassian-connect-spring-boot-acsb:unspecified:2.1.3"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"atlassian-connect-spring-boot-acsb","product_name":"Atlassian Connect Spring Boot (ACSB)","version_start":"2.1.4","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:atlassian-connect-spring-boot-acsb:2.1.4:unspecified"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"atlassian-connect-spring-boot-acsb","product_name":"Atlassian Connect Spring Boot (ACSB)","version_start":"unspecified","version_start_inclusive":true,"version_end":"2.1.5","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:atlassian-connect-spring-boot-acsb:unspecified:2.1.5"}],"exploit_refs":[],"news":[],"references":[{"url":"https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072","source_type":"MISC","tags":[]},{"url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-05-09T23:55:09.616000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"}]}