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Vulnerability record

CVE-2026-126781

highCVSS 4.0 7.7Published · webmin

The short answer

CVE-2026-126781 affects webmin webmin and is rated high (CVSS 7.7). It is not in CISA's Known Exploited Vulnerabilities catalog.

What it is

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.

Weakness: CWE-93.

Severity

7.7 high

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploited (CISA KEV)

Not listed

CISA lists confirmed exploitation only

EPSS, next 30 days

No score

FIRST scores CVEs within a day of publication

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
Present
Privileges required
Low
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Affected products

webmin. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-126781 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-12.

How do I fix CVE-2026-126781?

Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Deferred. The description is NVD's text, quoted as published.

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