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Servers and applications

CVE-2026-126781

Webmin through 2.670 Users File Injection via acl/cert_issue.cgi

Severity
High 7.7
Published
11 Nov 2026
Last changed
11 Nov 2026
Added to UpHeron
11 Nov 2026
Weakness
CRLF injection (CWE-93)
Attack
Over the network · Only under certain conditions · Needs a user account · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Sources
CVE Program

Description

Webmin through 2.670 contains a users file injection vulnerability in acl/cert_issue.cgi that allows authenticated Webmin users to inject lines by supplying unvalidated certificate DN fields containing newlines. Attackers can end a DN field with a backslash and newline to add a second root entry with a known password hash, gaining Webmin root access after miniserv restarts.

From the CVE Program.

Affected software

SoftwareAffected versions
WebminServers and applications · cna:webmin|webmin
  • Every version up to 2.670

References

  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-126781