How severe is CVE-2023-27397?

CVE-2023-27397 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-2023-27397 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-27397?

CVE-2023-27397 affects Microengine Mailform. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-27397?

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-2023-27397 published?

CVE-2023-27397 was published on 2023-05-23 and last updated on 2026-06-17.

CVE-2023-27397

CVE-2023-27397 is a critical-severity vulnerability in Microengine Mailform 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% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Microengine Mailform
Published: 2023-05-23
Last modified: 2026-06-17

Description

Unrestricted upload of file with dangerous type exists in MicroEngine Mailform version 1.1.0 to 1.1.8. If the product's file upload function and server save option are enabled, a remote attacker may save an arbitrary file on the server and execute it.

Frequently asked questions

What is CVE-2023-27397?: Unrestricted upload of file with dangerous type exists in MicroEngine Mailform version 1.1.0 to 1.1.8. If the product's file upload function and server save option are enabled, a remote attacker may save an arbitrary file on the server and execute it.
How severe is CVE-2023-27397?: CVE-2023-27397 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-2023-27397 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-27397?: CVE-2023-27397 affects Microengine Mailform. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-27397?: 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-2023-27397 published?: CVE-2023-27397 was published on 2023-05-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microengine:mailform:*:*:*:*:*:*:*:*

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