High severity7.7NVD Advisory· Published Apr 16, 2021· Updated Jun 17, 2026
CVE-2021-26073
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
atlassian-connect-expressnpm | >= 3.0.2, < 6.6.0 | 6.6.0 |
Affected products
3- cpe:2.3:a:atlassian:connect_express:*:*:*:*:*:node.js:*:*Range: >=3.0.2,<6.6.0
- Range: 3.0.2
Patches
Vulnerability mechanics
References
6- confluence.atlassian.com/pages/viewpage.actionnvdVendor AdvisoryWEB
- github.com/advisories/GHSA-4v96-m8xv-x83vghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-26073ghsaADVISORY
- security.netapp.com/advisory/ntap-20210604-0004/nvdThird Party Advisory
- community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a%5B%E2%80%A6%5Dypass-of-app-qsh-verification-via-context-jwts/47072nvdWEB
- security.netapp.com/advisory/ntap-20210604-0004ghsaWEB
News mentions
0No linked articles in our index yet.