6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2021-25313

CVE-2021-25313: Rancher Cross-site Scripting Vulnerability

A Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Rancher allows remote attackers to execute JavaScript via malicious links. This issue affects: SUSE Rancher Rancher versions prior to 2.5.6.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2021-25313

CVE-2021-25313:

6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/rancher/rancher	go	>= 2.5.0, < 2.5.6	2.5.6
github.com/rancher/rancher	go	>= 2.4.0, < 2.4.14	2.4.14
github.com/rancher/rancher	go	< 2.3.11	2.3.11

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The analysis focuses on:

API endpoint handlers processing user-controlled URL parameters (specifically /v3/cluster/ called out in SUSE bug)
Output generation mechanisms that would reflect these parameters without escaping
Security bulletin descriptions indicating URL parameter handling as the vulnerability source

While exact code diffs are unavailable, the combination of:

XSS via malicious links
Specific /v3/cluster/ endpoint references
Go's HTML template auto-escaping paradigm suggests vulnerable functions would be in the request handling chain for affected API endpoints, particularly where URL parameters interface with response generation.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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6.1

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2021-25313: Rancher Cross-site Scripting Vulnerability

CVE-2021-25313:

6.1

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

CVE-2021-25313: Rancher Cross-site Scripting Vulnerability

Basic Information

Basic Information

Technical Details

6.1

6.1

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI