AUGUST 4, 2026
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Case File

CVE-2021-26073

HIGH · CVSS 7.7 EPSS 0.92%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-04-16 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.7. See the original NVD description below for full technical details.

CVE
CVE-2021-26073
Severity
HIGH
CVSS
7.7
EPSS
0.92%

Original NVD 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.

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