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CVE-2021-26074

CVE-2021-26074: Broken Authentication in Atlassian Connect Spring Boot

6.5

CVSS Score
3.1

Basic Information

CVE ID
CVE-2021-26074
GHSA ID
GHSA-cpcr-74q9-74gp
EPSS Score
0.49113%
CWE
CWE-287
Published
5/10/2021
Updated
2/1/2023
KEV Status
No
Technology
TechnologyJava

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
com.atlassian.connect:atlassian-connect-spring-boot-startermaven>= 1.1.0, < 2.1.32.1.3

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from improper JWT type validation in lifecycle endpoints. Key authentication functions like JwtAuthenticationFilter.attemptAuthentication would process malicious context JWTs without proper server-to-server checks. The JwtVerification class's verify method would be invoked during this process, lacking QSH claim validation specific to context JWTs. These functions appear in stack traces when processing installation events, making them visible in runtime profilers during exploitation. The high confidence for JwtAuthenticationFilter comes from its central role in authentication flow, while JwtVerification has medium confidence due to indirect evidence from community code examples.

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 Sprin* *oot (**S*) *rom v*rsion *.*.* ***or* v*rsion *.*.*. *tl*ssi*n *onn**t Sprin* *oot is * J*v* Sprin* *oot p**k*** *or *uil*in* *tl*ssi*n *onn**t *pps. *ut**nti**tion **tw**n *tl*ssi*n pro*u*ts *n* t**

Reasoning

T** vuln*r**ility st*ms *rom improp*r JWT typ* v*li**tion in li***y*l* *n*points. K*y *ut**nti**tion *un*tions lik* Jwt*ut**nti**tion*ilt*r.*tt*mpt*ut**nti**tion woul* pro**ss m*li*ious *ont*xt JWTs wit*out prop*r s*rv*r-to-s*rv*r ****ks. T** JwtV*ri