CVE-2026-123621 (GCVE-0-2026-123621)
Vulnerability from cvelistv5 – Published: 2026-11-06 15:00 – Updated: 2026-11-06 17:26
VLAI
EPSS
VEX
Title
Usermin through 2.570 Path Traversal File Write via detachall.cgi
Summary
Usermin through 2.570 contains a path traversal vulnerability in mailbox/detachall.cgi that allows remote unauthenticated attackers to write files outside the temporary directory via unsanitized attachment filenames. Attackers can email attachments with ../ sequences in filenames, and when the recipient downloads all attachments, files like ~/.forward are overwritten, enabling command execution.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 17:24 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
VulnCheck
CNA
References
6 references
| URL | Tags |
|---|---|
| https://github.com/webmin/usermin/issues/142 | issue-tracking |
| https://github.com/webmin/usermin | product |
| https://github.com/webmin/usermin/commit/cb4614e8… | patch |
| https://github.com/webmin/usermin/blob/2.570/mail… | technical-description |
| https://hackmd.io/@leediay/H144QKY6zl | technical-description |
| https://www.vulncheck.com/advisories/usermin-thro… | third-party-advisory |
Impacted products
Date Public
2026-11-05 00:00
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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