How severe is CVE-2026-2743?

CVE-2026-2743 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-2026-2743 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2743?

CVE-2026-2743 affects Seppmail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2743?

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-2026-2743 have an EU (EUVD) identifier?

Yes. CVE-2026-2743 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9794.

When was CVE-2026-2743 published?

CVE-2026-2743 was published on 2026-03-05 and last updated on 2026-06-17.

CVE-2026-2743

CVE-2026-2743 is a critical-severity vulnerability in Seppmail 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 10.0
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9794
Weakness: CWE-22
Affected product: Seppmail
Published: 2026-03-05
Last modified: 2026-06-17

Description

Arbitrary File Write via Path Traversal upload to Remote Code Execution in SeppMail User Web Interface. The affected feature is the large file transfer (LFT). This issue affects SeppMail: 15.0.2.1 and before

Frequently asked questions

What is CVE-2026-2743?: Arbitrary File Write via Path Traversal upload to Remote Code Execution in SeppMail User Web Interface. The affected feature is the large file transfer (LFT). This issue affects SeppMail: 15.0.2.1 and before
How severe is CVE-2026-2743?: CVE-2026-2743 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-2026-2743 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2743?: CVE-2026-2743 affects Seppmail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2743?: 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-2026-2743 have an EU (EUVD) identifier?: Yes. CVE-2026-2743 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9794.
When was CVE-2026-2743 published?: CVE-2026-2743 was published on 2026-03-05 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Seppmail

CVE-2026-27441 — Critical (CVSS 9.8): SEPPmail Secure Email Gateway before version 15.0.1 insufficiently neutralizes the PDF encryption password, allowing OS…
CVE-2026-2747 — High (CVSS 7.5): SEPPmail Secure Email Gateway before version 15.0.1 decrypts inline PGP messages without isolating them from…
CVE-2026-27444 — High (CVSS 7.5): SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email headers,…
CVE-2026-27443 — High (CVSS 7.5): SEPPmail Secure Email Gateway before version 15.0.1 does not properly sanitize the headers from S/MIME protected MIME…
CVE-2026-27442 — High (CVSS 7.5): The GINA web interface in SEPPmail Secure Email Gateway before version 15.0.1 does not properly check attachment…
CVE-2021-31740 — Medium (CVSS 6.1): SEPPMail's web frontend, user input is not embedded correctly in the web page and therefore leads to cross-site…

All CVEs affecting Seppmail →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-48282 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Limitation of a Pathname to a Restricted…
CVE-2026-54917 — Critical (CVSS 10.0): SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the…
CVE-2026-11429 — Critical (CVSS 10.0): Two endpoints in the Vault Service ScriptsController, shared by Altium Enterprise Server and Altium 365, accept file…
CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
CVE-2026-7411 — Critical (CVSS 10.0): In Eclipse BaSyx Java Server SDK versions prior to 2.0.0-milestone-10, inadequate path normalization in the Submodel…
CVE-2026-36767 — Critical (CVSS 10.0): A path traversal vulnerability in the /content/images/add endpoint of shopizer v3.2.5 allows attackers write arbitrary…

Browse all CWE-22 (Path Traversal) vulnerabilities →