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CVE-2026-123621VulnerabilityPublished

Usermin through 2.570 contains a path traversal vulnerability in mailbox/detachall.cgi that allows remote

Source GCVE Database

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Authoritative record:CVE-2026-123621· High 8.6

Not known to be exploited · CVSS 8.6 High.

Data as of 6 Nov 2026, 16:50 UTC

CVSS 4.0 base score
8.6High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.08.6
CNA (VulnCheck)CVSS 3.18.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
webminuserminAffected
  • <=2.570
Fixed in–
GitHubuserminpkg:github/userminOther threatsAffected
  • <=2.570
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a fix is available, restrict access to the vulnerable Usermin service and monitor for suspicious activity related to mailbox attachment handling.

Description

Usermin versions up to 2.570 have a path traversal vulnerability in the mailbox/detachall.cgi script. This flaw allows remote unauthenticated attackers to write files outside the intended temporary directory by exploiting unsanitized attachment filenames containing '../' sequences. By sending specially crafted email attachments and triggering the download of all attachments, attackers can overwrite critical files such as ~/.forward, potentially enabling command execution on the affected system.

References

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