How severe is CVE-2026-27444?

CVE-2026-27444 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-27444 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27444?

CVE-2026-27444 affects Seppmail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27444?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-27444 have an EU (EUVD) identifier?

Yes. CVE-2026-27444 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9380.

When was CVE-2026-27444 published?

CVE-2026-27444 was published on 2026-03-04 and last updated on 2026-06-17.

CVE-2026-27444

CVE-2026-27444 is a high-severity vulnerability in Seppmail with a CVSS 3.x base score of 7.5. 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-436.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 7.8
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9380
Weakness: CWE-436
Affected product: Seppmail
Published: 2026-03-04
Last modified: 2026-06-17

Description

SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email headers, causing an interpretation conflict with other mail infrastructure that allows an attacker to fake the source of the email or decrypt it.

Frequently asked questions

What is CVE-2026-27444?: SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email headers, causing an interpretation conflict with other mail infrastructure that allows an attacker to fake the source of the email or decrypt it.
How severe is CVE-2026-27444?: CVE-2026-27444 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-27444 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27444?: CVE-2026-27444 affects Seppmail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27444?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27444 have an EU (EUVD) identifier?: Yes. CVE-2026-27444 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9380.
When was CVE-2026-27444 published?: CVE-2026-27444 was published on 2026-03-04 and last updated on 2026-06-17.

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure

Affected products (1)

cpe:2.3:a:seppmail:seppmail:*:*:*:*:*:*:*:*

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