CVE-2026-39900: Cacti: Reflected XSS via tab parameter in auth_profile.php JavaScript context

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-24 · updated 2026-06-25
Weakness: CWE-79

Description

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Reflected XSS via tab parameter in the auth_profile.php JavaScript context. This issue has been fixed in version 1.2.31.

Affected products

cacti: before 1.2.31 — fixed in 1.2.31

How to fix

Upgrade to a fixed version: cacti 1.2.31. Check the vendor advisory for mitigations.

References

https://github.com/Cacti/cacti/commit/891344a5c10b8687a3d2a5d26e6de20f13069e2a
https://github.com/Cacti/cacti/security/advisories/GHSA-34rf-frc3-v48r

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