How severe is CVE-2026-39900?

CVE-2026-39900 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-39900 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39900?

CVE-2026-39900 affects Cacti. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39900?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-39900 have an EU (EUVD) identifier?

Yes. CVE-2026-39900 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39135.

When was CVE-2026-39900 published?

CVE-2026-39900 was published on 2026-06-24 and last updated on 2026-06-25.

CVE-2026-39900

CVE-2026-39900 is a medium-severity vulnerability in Cacti with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39135
Weakness: CWE-79
Affected product: Cacti
Published: 2026-06-24
Last modified: 2026-06-25

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-39900?: CVE-2026-39900 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-39900 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39900?: CVE-2026-39900 affects Cacti. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39900?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39900 have an EU (EUVD) identifier?: Yes. CVE-2026-39900 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39135.
When was CVE-2026-39900 published?: CVE-2026-39900 was published on 2026-06-24 and last updated on 2026-06-25.

References

Affected products (1)

cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*

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