CVE-2021-35210: Cross site scripting in the system log
6.1
CVSS Score
3.1
Basic Information
CVE ID
GHSA ID
EPSS Score
0.542%
CWE
Published
7/1/2021
Updated
4/22/2024
KEV Status
No
Technology
PHP
Technical Details
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
---|---|---|---|
contao/core-bundle | composer | >= 4.5.0, < 4.9.16 | 4.9.16 |
contao/core-bundle | composer | >= 4.10.0, < 4.11.5 | 4.11.5 |
contao/contao | composer | >= 4.5.0, < 4.9.16 | 4.9.16 |
contao/contao | composer | >= 4.10.0, < 4.11.5 | 4.11.5 |
Vulnerability Intelligence
Miggo AI
Root Cause Analysis
The vulnerability stems from unescaped output of stored log data in the backend interface. While exact function names aren't visible in provided resources, Contao's architecture suggests:
- Controller methods handling log display would retrieve data from tl_log
- Templates rendering log entries would lack output encoding
- The patch likely added proper escaping in these locations Confidence is medium due to lack of direct code references, but the pattern matches classic stored XSS vulnerabilities in MVC frameworks.