How severe is CVE-2026-29136?

CVE-2026-29136 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-29136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29136?

CVE-2026-29136 affects Seppmail Secure Email Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29136?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-29136 have an EU (EUVD) identifier?

Yes. CVE-2026-29136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18152.

When was CVE-2026-29136 published?

CVE-2026-29136 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-29136

CVE-2026-29136 is a medium-severity vulnerability in Seppmail Secure Email Gateway with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18152
Weakness: CWE-79
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 an attacker to inject HTML into notification emails about new CA certificates.

Frequently asked questions

What is CVE-2026-29136?: SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to inject HTML into notification emails about new CA certificates.
How severe is CVE-2026-29136?: CVE-2026-29136 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-29136 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29136?: CVE-2026-29136 affects Seppmail Secure Email Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29136?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-29136 have an EU (EUVD) identifier?: Yes. CVE-2026-29136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18152.
When was CVE-2026-29136 published?: CVE-2026-29136 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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