Critical 9.4Published May 27, 2026

CVE-2026-49103Webmin before 2.640 does not safely construct a filename for saving of an attachment within the mailboxes component.

Updated under an hour ago (Oct 26, 2026, 1:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Webmin before 2.640 does not safely construct a filename for saving of an attachment within the mailboxes component. This occurs in mailboxes/detachall.cgi.

CVSS: 9.4 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weakness (CWE): CWE-24
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Deferred
Record last updated: May 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Webmin Webmin webmin:webmin (from the name)	before 2.640	CNA record

References

References

https://github.com/webmin/webmin/commit/cf432879a14568c4bb44cd2f9e5a9bd0e168edc1
https://github.com/webmin/webmin/compare/2.630...2.640

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.