High severity · published Apr 16, 2021
CVE-2021-26073
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…
7.7
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CE
Connect Express · Atlassian
3.0.2 before 6.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26073
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26073
community.developer.atlassian.com
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
Vendor Advisory
https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210604-0004/