Medium severity · published Jun 23, 2021
CVE-2021-35210
Contao 4.5.x through 4.9.x before 4.9.16, and 4.10.x through 4.11.x before 4.11.5, allows XSS
6.1
CVSS
0.7%
EPSS
No
On KEV
Description
Contao 4.5.x through 4.9.x before 4.9.16, and 4.10.x through 4.11.x before 4.11.5, allows XSS. It is possible to inject code into the tl_log table that will be executed in the browser when the system log is called in the back end.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
Contao · Contao
4.5.0 before 4.9.16; 4.10.0 before 4.11.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-35210
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-35210
Vendor Advisory
https://contao.org/en/security-advisories/cross-site-scripting-in-the-system-log-2021.html
Third Party Advisory
https://github.com/contao/contao/security/advisories/GHSA-h58v-c6rf-g9f7
More from Contao
9.8
CVE-2022-26265
Contao Managed Edition v1.5.0 was discovered to contain a remote command execution (RCE) vulnerability via the component php_cli parameter
9.8
CVE-2019-11512
Contao 4.x allows SQL Injection
9.3
CVE-2026-107845
Contao: Cross-site scripting in the comments bundle
8.8
CVE-2024-45398
Contao is an Open Source CMS
8.8
CVE-2012-4383
contao prior to 2.11.4 has a sql injection vulnerability