How severe is CVE-2026-44129?

CVE-2026-44129 has a CVSS 4.0 base score of 8.3, rated high severity.

Is CVE-2026-44129 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44129?

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-2026-44129 have an EU (EUVD) identifier?

Yes. CVE-2026-44129 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28589.

When was CVE-2026-44129 published?

CVE-2026-44129 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2026-44129

CVE-2026-44129 is a high-severity vulnerability with a CVSS 4.0 base score of 8.3. 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-1336.

Key facts

Severity: High (CVSS 4.0 base score 8.3)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28589
Weakness: CWE-1336
Published: 2026-05-08
Last modified: 2026-06-17

Description

SEPPmail Secure Email Gateway before version 15.0.4 contains a server-side template injection vulnerability in the new GINA UI because an endpoint accepts attacker-controlled template, allowing remote attackers to execute arbitrary template expressions and potentially achieve remote code execution depending on the enabled template plugins.

Frequently asked questions

What is CVE-2026-44129?: SEPPmail Secure Email Gateway before version 15.0.4 contains a server-side template injection vulnerability in the new GINA UI because an endpoint accepts attacker-controlled template, allowing remote attackers to execute arbitrary template expressions and potentially achieve remote code execution depending on the enabled template plugins.
How severe is CVE-2026-44129?: CVE-2026-44129 has a CVSS 4.0 base score of 8.3, rated high severity.
Is CVE-2026-44129 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44129?: 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-2026-44129 have an EU (EUVD) identifier?: Yes. CVE-2026-44129 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28589.
When was CVE-2026-44129 published?: CVE-2026-44129 was published on 2026-05-08 and last updated on 2026-06-17.

References

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