How severe is CVE-2026-39955?

CVE-2026-39955 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-39955 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39955?

CVE-2026-39955 affects Cacti. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39955?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-39955 have an EU (EUVD) identifier?

Yes. CVE-2026-39955 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39137.

When was CVE-2026-39955 published?

CVE-2026-39955 was published on 2026-06-24 and last updated on 2026-06-26.

CVE-2026-39955

CVE-2026-39955 is a critical-severity vulnerability in Cacti with a CVSS 3.x base score of 9.8. 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39137
Weakness: CWE-89
Affected product: Cacti
Published: 2026-06-24
Last modified: 2026-06-26

Description

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have pre-authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php. This issue has been fixed in version 1.2.31.

Frequently asked questions

What is CVE-2026-39955?: Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have pre-authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php. This issue has been fixed in version 1.2.31.
How severe is CVE-2026-39955?: CVE-2026-39955 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-39955 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39955?: CVE-2026-39955 affects Cacti. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39955?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-39955 have an EU (EUVD) identifier?: Yes. CVE-2026-39955 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39137.
When was CVE-2026-39955 published?: CVE-2026-39955 was published on 2026-06-24 and last updated on 2026-06-26.

References

Affected products (1)

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

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