Cross-site scripting in Cacti - CVE-2026-39897
Published: June 19, 2026
Vulnerability identifier: #VU134961
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-39897
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script in a user's browser.
The vulnerability exists due to cross-site scripting in html_auth_footer error message output when handling crafted input in error messages. A remote attacker can supply specially crafted input to execute arbitrary script in a user's browser.
Affected software
Cacti
How to mitigate CVE-2026-39897
Install security update from vendor's website.
Cacti - update to 1.2.31