How severe is CVE-2026-29139?

CVE-2026-29139 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-29139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29139?

CVE-2026-29139 affects Seppmail Secure Email Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29139?

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

Does CVE-2026-29139 have an EU (EUVD) identifier?

Yes. CVE-2026-29139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18158.

When was CVE-2026-29139 published?

CVE-2026-29139 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-29139

CVE-2026-29139 is a critical-severity vulnerability in Seppmail Secure Email Gateway with a CVSS 3.x base score of 9.8. 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-288.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 7.8
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18158
Weakness: CWE-288
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 account takeover by abusing GINA account initialization to reset a victim account password.

Frequently asked questions

What is CVE-2026-29139?: SEPPmail Secure Email Gateway before version 15.0.3 allows account takeover by abusing GINA account initialization to reset a victim account password.
How severe is CVE-2026-29139?: CVE-2026-29139 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-29139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29139?: CVE-2026-29139 affects Seppmail Secure Email Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-29139 have an EU (EUVD) identifier?: Yes. CVE-2026-29139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18158.
When was CVE-2026-29139 published?: CVE-2026-29139 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:*:*:*:*:*:*:*:*

More vulnerabilities in Seppmail Secure Email Gateway

CVE-2026-29143 — Critical (CVSS 9.1): SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of…
CVE-2026-29133 — Critical (CVSS 9.1): SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to upload PGP keys with UIDs that do not match…
CVE-2026-29138 — High (CVSS 7.5): SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to claim…
CVE-2026-29135 — High (CVSS 7.5): SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to craft a password-tag that bypasses subject…
CVE-2026-29134 — High (CVSS 7.5): SEPPmail Secure Email Gateway before version 15.0.3 allows an external user to modify GINA webdomain metadata and…
CVE-2026-29132 — High (CVSS 7.5): SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker with access to a victim's GINA account to bypass…

All CVEs affecting Seppmail Secure Email Gateway →

Other CWE-288 vulnerabilities

CVE-2026-53622 — Critical (CVSS 10.0): Traefik is an HTTP reverse proxy and load balancer. Prior to 3.7.3, there is a critical vulnerability in Traefik's…
CVE-2026-48491 — Critical (CVSS 10.0): Traefik is an HTTP reverse proxy and load balancer. From 3.7.0 until 3.7.3, there is a high severity vulnerability in…
CVE-2026-48020 — Critical (CVSS 10.0): Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity…
CVE-2026-20079 — Critical (CVSS 10.0): A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an…
CVE-2024-10081 — Critical (CVSS 10.0): CodeChecker is an analyzer tooling, defect database and viewer extension for the Clang Static Analyzer and Clang Tidy.…
CVE-2024-2973 — Critical (CVSS 10.0): An Authentication Bypass Using an Alternate Path or Channel vulnerability in Juniper Networks Session Smart Router or…

Browse all CWE-288 vulnerabilities →