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CVE-2017-20158

CVE-2017-20158: Yii2 FileAPI Widget vulnerable to Cross-site Scripting

6.1

CVSS Score
3.1

Basic Information

CVE ID
CVE-2017-20158
GHSA ID
GHSA-j82x-fh8h-326g
EPSS Score
0.2972%
CWE
CWE-79
Published
12/31/2022
Updated
12/29/2023
KEV Status
No
Technology
TechnologyPHP

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
vova07/yii2-fileapi-widgetcomposer< 0.1.90.1.9

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from the unescaped error message output in the run() method. The commit diff shows the fix adds Html::encode() to sanitize the error message. Since this method handles user-controlled file upload errors and directly returns the unescaped value in JSON responses, it creates an XSS vector when the error message is rendered in the browser. The patch confirmation and CWE-79 classification confirm this is an XSS vulnerability caused by improper output encoding in this function.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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