How severe is CVE-2025-65318?

CVE-2025-65318 has a CVSS 3.x base score of 9.1, 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 none.

Is CVE-2025-65318 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65318?

CVE-2025-65318 affects Canarymail Canary Mail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65318?

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-2025-65318 have an EU (EUVD) identifier?

Yes. CVE-2025-65318 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203807.

When was CVE-2025-65318 published?

CVE-2025-65318 was published on 2025-12-16 and last updated on 2026-07-05.

CVE-2025-65318

CVE-2025-65318 is a critical-severity vulnerability in Canarymail Canary Mail with a CVSS 3.x base score of 9.1. 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-693.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203807
Weakness: CWE-693
Affected product: Canarymail Canary Mail
Published: 2025-12-16
Last modified: 2026-07-05

Description

When using the attachment interaction functionality, Canary Mail 5.1.40 and below saves documents to a file system without a Mark-of-the-Web tag, which allows attackers to bypass the built-in file protection mechanisms of both Windows OS and third-party software.

Frequently asked questions

What is CVE-2025-65318?: When using the attachment interaction functionality, Canary Mail 5.1.40 and below saves documents to a file system without a Mark-of-the-Web tag, which allows attackers to bypass the built-in file protection mechanisms of both Windows OS and third-party software.
How severe is CVE-2025-65318?: CVE-2025-65318 has a CVSS 3.x base score of 9.1, 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 none.
Is CVE-2025-65318 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65318?: CVE-2025-65318 affects Canarymail Canary Mail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65318?: 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-2025-65318 have an EU (EUVD) identifier?: Yes. CVE-2025-65318 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203807.
When was CVE-2025-65318 published?: CVE-2025-65318 was published on 2025-12-16 and last updated on 2026-07-05.

References

EU advisories (EUVD)

Affected products (1)

cpe:2.3:a:canarymail:canary_mail:*:*:*:*:*:windows:*:*

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