What is CVE-2026-39897?

CVE-2026-39897 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-2026-39897?

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

XSS in Cacti

CVE-2026-39897

Cacti is an open source performance and fault management framework. Versions 1.2.30 and below contain a Reflected XSS vulnerability in the html_auth_footer. This issue has been fixed in version 1.2.31.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-06-24 · last modified 2026-06-25.

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.

EPSS exploit prediction

EPSS: 0.003 (16.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Cacti — versions < 1.2.31

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/Cacti/cacti/commit/7c544ea0b45de627f206eefe93005433c2c3864d (Patch)
github.com/Cacti/cacti/security/advisories/GHSA-2j98-xfjq-gw39 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-39897?: CVE-2026-39897 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-2026-39897?: Medium severity. CVSS v3 base score is 6.1 out of 10.