{"id":"CVE-2021-26073","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-26073","summary":"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.…","details":"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.","published":"2021-04-16T03:15:12.033","modified":"2026-06-17T03:42:48.113","cvss":{"score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","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"},{"type":"ADVISORY","url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210604-0004/"},{"type":"WEB","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"},{"type":"ADVISORY","url":"https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210604-0004/"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-06-17T03:42:48.113"}}