Is CVE-2026-8811 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8811 being exploited in the wild.

How severe is CVE-2026-8811?

Informational severity, with a CVSS score of 7.1, published 18 June 2026.

Which products and versions are affected?

SEPPmail AG Secure Email Gateway before 15.0.5.

Is there a fix for CVE-2026-8811?

A patch was published on 2026-05-30: Fixed in version 15.0.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-8811 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-8811?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-8811: SEPPmail Secure Email Gateway path traversal in PDF module

CVE-2026-8811 · Severity: info · CVSS 7.1 · Published 2026-06-18

SEPPmail Secure Email Gateway, a solution used for secure corporate email communication, contains a vulnerability in its PDF encryption module. An attacker can exploit this flaw to create unauthorized files on the system, potentially placing them in locations accessible via the web. This could lead to the compromise of the gateway's integrity or the hosting of malicious content on the appliance.

Quick answers

Is CVE-2026-8811 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8811 being exploited in the wild.
How severe is CVE-2026-8811?: Informational severity, with a CVSS score of 7.1, published 18 June 2026.
Which products and versions are affected?: SEPPmail AG Secure Email Gateway before 15.0.5.
Is there a fix for CVE-2026-8811?: A patch was published on 2026-05-30: Fixed in version 15.0.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-8811 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-8811?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A path traversal vulnerability (CWE-22) exists in the PDF module of SEPPmail Secure Email Gateway when handling attachment filenames during encrypted PDF generation. The root cause is improper validation of filenames for embedded attachments, which allows an attacker with low privileges to use traversal sequences to write files to arbitrary locations on the filesystem, including web-accessible directories. This vulnerability was addressed in version 15.0.5 by improving filename handling. The attack requires network access and low-level authentication (PR:L) to trigger the PDF generation process.

Affected products

SEPPmail AG Secure Email Gateway before 15.0.5

Timeline

2026-05-30: patched: Fixed in version 15.0.5
2026-06-18: disclosed: CVE published and NVD entry created

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html

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