How severe is CVE-2023-39970?

CVE-2023-39970 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-2023-39970 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39970?

CVE-2023-39970 affects Acyba Acymailing Starter. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39970?

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.

When was CVE-2023-39970 published?

CVE-2023-39970 was published on 2023-08-17 and last updated on 2026-06-17.

CVE-2023-39970

CVE-2023-39970 is a critical-severity vulnerability in Acyba Acymailing Starter 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-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Acyba Acymailing Starter
Published: 2023-08-17
Last modified: 2026-06-17

Description

Unrestricted Upload of File with Dangerous Type vulnerability in AcyMailing component for Joomla. It allows remote code execution.

Frequently asked questions

What is CVE-2023-39970?: Unrestricted Upload of File with Dangerous Type vulnerability in AcyMailing component for Joomla. It allows remote code execution.
How severe is CVE-2023-39970?: CVE-2023-39970 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-2023-39970 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39970?: CVE-2023-39970 affects Acyba Acymailing Starter. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-39970?: 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.
When was CVE-2023-39970 published?: CVE-2023-39970 was published on 2023-08-17 and last updated on 2026-06-17.

References

https://extensions.joomla.org/extension/acymailing-starter/

Affected products (1)

cpe:2.3:a:acyba:acymailing_starter:*:*:*:*:*:joomla\!:*:*

Other CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities

CVE-2026-48283 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Unrestricted Upload of File with Dangerous Type…
CVE-2026-48276 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Unrestricted Upload of File with Dangerous Type…
CVE-2026-57700 — Critical (CVSS 10.0): Unrestricted Upload of File with Dangerous Type vulnerability in Daan.Dev OMGF Pro allows Using Malicious Files. This…
CVE-2025-69129 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in WordPress & WooCommerce Scraper Plugin, Import Data from Any Site <= 1.0.7…
CVE-2026-40772 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in GeekyBot <= 1.2.2 versions.
CVE-2026-40412 — Critical (CVSS 10.0): Unrestricted upload of file with dangerous type in Azure Orbital Spatio allows an unauthorized attacker to execute code…

Browse all CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities →