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CVE-2021-26073

CVE-2021-26073: Broken Authentication in Atlassian Connect Express

7.7

CVSS Score
3.1

Basic Information

CVE ID
CVE-2021-26073
GHSA ID
GHSA-4v96-m8xv-x83v
EPSS Score
0.56323%
CWE
CWE-287
Published
5/24/2022
Updated
2/12/2025
KEV Status
No
Technology
TechnologyJavaScript

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
atlassian-connect-expressnpm>= 3.0.2, < 6.6.06.6.0

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from improper JWT type validation in authentication middleware. The critical function is addon.authenticate() which handles request authentication. In vulnerable versions (3.0.2-6.5.0), this middleware didn't properly restrict context JWTs in lifecycle endpoints. The patch requires explicit skipQshVerification=true parameter for context JWT endpoints, indicating the base authenticate() function was missing server-to-server JWT enforcement. This matches community guidance showing vulnerable endpoints used standard authenticate() while fixed implementations require parameterization.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

*rok*n *ut**nti**tion in *tl*ssi*n *onn**t *xpr*ss (***) *rom v*rsion *.*.* ***or* v*rsion *.*.*: *tl*ssi*n *onn**t *xpr*ss is * No**.js p**k*** *or *uil*in* *tl*ssi*n *onn**t *pps. *ut**nti**tion **tw**n *tl*ssi*n pro*u*ts *n* t** *tl*ssi*n *onn**t

Reasoning

T** vuln*r**ility st*ms *rom improp*r JWT typ* v*li**tion in *ut**nti**tion mi**l*w*r*. T** *riti**l *un*tion is `***on.*ut**nti**t*()` w*i** **n*l*s r*qu*st *ut**nti**tion. In vuln*r**l* v*rsions (*.*.*-*.*.*), t*is mi**l*w*r* *i*n't prop*rly r*stri