How severe is CVE-2026-39893?

CVE-2026-39893 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-2026-39893 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39893?

CVE-2026-39893 affects Cacti. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39893?

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-2026-39893 have an EU (EUVD) identifier?

Yes. CVE-2026-39893 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39131.

When was CVE-2026-39893 published?

CVE-2026-39893 was published on 2026-06-24 and last updated on 2026-06-26.

CVE-2026-39893

CVE-2026-39893 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% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39131
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. In versions 1.2.30 and prior, the rfilter request variable was concatenated into a RLIKE SQL clause without sanitization. The endpoint does not require authentication (graph viewing supports guest access via the configured guest user), so the SQLi was reachable pre-auth on installs with guest viewing enabled. This issue was fixed in version 1.2.31.

Frequently asked questions

What is CVE-2026-39893?: Cacti is an open source performance and fault management framework. In versions 1.2.30 and prior, the rfilter request variable was concatenated into a RLIKE SQL clause without sanitization. The endpoint does not require authentication (graph viewing supports guest access via the configured guest user), so the SQLi was reachable pre-auth on installs with guest viewing enabled. This issue was fixed in version 1.2.31.
How severe is CVE-2026-39893?: CVE-2026-39893 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-2026-39893 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39893?: CVE-2026-39893 affects Cacti. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39893?: 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-2026-39893 have an EU (EUVD) identifier?: Yes. CVE-2026-39893 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39131.
When was CVE-2026-39893 published?: CVE-2026-39893 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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