How severe is CVE-2026-29138?

CVE-2026-29138 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-2026-29138 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-2026-29138?

CVE-2026-29138 affects Seppmail Secure Email Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29138?

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-2026-29138 have an EU (EUVD) identifier?

Yes. CVE-2026-29138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18156.

When was CVE-2026-29138 published?

CVE-2026-29138 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-29138

CVE-2026-29138 is a high-severity vulnerability in Seppmail Secure Email Gateway 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-90.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18156
Weakness: CWE-90
Affected product: Seppmail Secure Email Gateway
Published: 2026-04-02
Last modified: 2026-06-17

Description

SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to claim another user's PGP signature as their own.

Frequently asked questions

What is CVE-2026-29138?: SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to claim another user's PGP signature as their own.
How severe is CVE-2026-29138?: CVE-2026-29138 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-2026-29138 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-2026-29138?: CVE-2026-29138 affects Seppmail Secure Email Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29138?: 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-2026-29138 have an EU (EUVD) identifier?: Yes. CVE-2026-29138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18156.
When was CVE-2026-29138 published?: CVE-2026-29138 was published on 2026-04-02 and last updated on 2026-06-17.

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503

Affected products (1)

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

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