How severe is CVE-2026-8811?

CVE-2026-8811 has a CVSS 4.0 base score of 7.1, rated high severity.

Is CVE-2026-8811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8811?

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-2026-8811 have an EU (EUVD) identifier?

Yes. CVE-2026-8811 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37866.

When was CVE-2026-8811 published?

CVE-2026-8811 was published on 2026-06-18 and last updated on 2026-06-22.

CVE-2026-8811

CVE-2026-8811 is a high-severity vulnerability with a CVSS 4.0 base score of 7.1. 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-22.

Key facts

Severity: High (CVSS 4.0 base score 7.1)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37866
Weakness: CWE-22
Published: 2026-06-18
Last modified: 2026-06-22

Description

SEPPmail versions before 15.0.5 allow improper handling of attachment filenames during encrypted PDF generation. An attacker can exploit this to create new files outside the intended directory, potentially placing files in web-accessible locations.

Frequently asked questions

What is CVE-2026-8811?: SEPPmail versions before 15.0.5 allow improper handling of attachment filenames during encrypted PDF generation. An attacker can exploit this to create new files outside the intended directory, potentially placing files in web-accessible locations.
How severe is CVE-2026-8811?: CVE-2026-8811 has a CVSS 4.0 base score of 7.1, rated high severity.
Is CVE-2026-8811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-8811?: 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-2026-8811 have an EU (EUVD) identifier?: Yes. CVE-2026-8811 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37866.
When was CVE-2026-8811 published?: CVE-2026-8811 was published on 2026-06-18 and last updated on 2026-06-22.

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#possible-path-traversal-vulnerability

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