How severe is CVE-2026-39938?

CVE-2026-39938 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-2026-39938 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39938?

CVE-2026-39938 affects Cacti. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39938?

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-2026-39938 have an EU (EUVD) identifier?

Yes. CVE-2026-39938 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39136.

When was CVE-2026-39938 published?

CVE-2026-39938 was published on 2026-06-24 and last updated on 2026-06-26.

CVE-2026-39938

CVE-2026-39938 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39136
Weakness: CWE-22
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 unauthenticated LFI through graph_theme and rrdtool IPC serialization hardening. This issue has been resolved in version 1.2.31.

Frequently asked questions

What is CVE-2026-39938?: Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have unauthenticated LFI through graph_theme and rrdtool IPC serialization hardening. This issue has been resolved in version 1.2.31.
How severe is CVE-2026-39938?: CVE-2026-39938 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-2026-39938 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39938?: CVE-2026-39938 affects Cacti. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39938?: 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-2026-39938 have an EU (EUVD) identifier?: Yes. CVE-2026-39938 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39136.
When was CVE-2026-39938 published?: CVE-2026-39938 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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