Auth bypass in Atlassian Connect Spring Boot (Acsb)
CVE-2021-26077
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (59.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Atlassian Connect Spring Boot (Acsb) — versions 1.1.0, unspecified, 2.1.4
- Atlassian Connect Spring Boot
Weakness classification (CWE)
References
- community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerabi… (Exploit, Issue Tracking, Vendor Advisory)
- confluence.atlassian.com/pages/viewpage.action (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-26077?
- CVE-2021-26077 is a high-severity vulnerability in Atlassian Connect Spring Boot (Acsb), classified under Improper Authentication. CVSS score: 8.8/10. Published 2021-05-10.
- How severe is CVE-2021-26077?
- High severity. CVSS v3 base score is 8.8 out of 10.