What is CVE-2026-39900?

CVE-2026-39900 is a medium-severity vulnerability in Cacti, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-24.

How severe is CVE-2026-39900?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Cacti

CVE-2026-39900

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (6.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Cacti — versions < 1.2.31

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-39900?: CVE-2026-39900 is a medium-severity vulnerability in Cacti, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-24.
How severe is CVE-2026-39900?: Medium severity. CVSS v3 base score is 6.1 out of 10.