Is CVE-2026-49102 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-49102 being exploited in the wild.

How severe is CVE-2026-49102?

Medium severity, with a CVSS score of 6.1, published 27 May 2026.

Is there a fix for CVE-2026-49102?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-49102 attacked?

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

Am I affected by CVE-2026-49102?

Check whether you run Webmin at an affected version. 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-2026-49102: Webmin XSS in mailboxes component via SVG attachment

CVE-2026-49102 · Severity: medium · CVSS 6.1 · Published 2026-05-27

Webmin is a web-based interface for system administration on Unix-like systems. A security vulnerability in its email management component allows an attacker to send a specially crafted email attachment that, when viewed by a user, executes malicious scripts in their browser. This could lead to unauthorized actions being performed on behalf of the user or the theft of sensitive session information.

Technologies: Webmin. Vendors: Webmin.

Quick answers

Is CVE-2026-49102 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-49102 being exploited in the wild.
How severe is CVE-2026-49102?: Medium severity, with a CVSS score of 6.1, published 27 May 2026.
Which products and versions are affected?: Webmin before 2.640.
Is there a fix for CVE-2026-49102?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-49102 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-49102?: Check whether you run Webmin at an affected version. 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 Cross-Site Scripting (XSS) vulnerability exists in Webmin's mailboxes component, specifically within 'mailboxes/detach.cgi'. The issue stems from the application serving SVG document attachments using the 'image/svg+xml' MIME type instead of a safer alternative like 'text/plain'. Because SVG files can contain embedded JavaScript, an attacker can send an email with a malicious SVG attachment; when a victim views or detaches this file through the Webmin interface, the script executes within the context of the victim's session. This is a reflected XSS attack requiring user interaction. The vulnerability is addressed in version 2.640 by improving attachment handling.

Affected products

Webmin Webmin before 2.640

Timeline

2026-05-27: disclosed
2026-05-27: advisory

References

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