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  4. CVE 2026 126781 webmin through 2670 users file injection via
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Back to active CVEs
High · CVSS 7.7CVE-2026-126781

Webmin through 2.670 Users File Injection via acl/cert_issue.cgiCVE-2026-126781

Answer in brief

CVE-2026-126781 records a High severity (CVSS 7.7) vulnerability in Webmin through 2.670 Users File Injection via acl/cert_issue.cgi. The current sources do not mark it as known exploited. The current feed maps webmin/webmin (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 11, 2026Updated Nov 11, 2026Source checked Nov 11, 2026First seen by HOL Nov 11, 2026Material review Nov 11, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps webmin/webmin (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
webmin/webmingeneric>=0 <=2.670Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for webmin/webmin.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 11, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Webmin through 2.670 Privilege Escalation via acl/save_group.cgiSame webmin/webmin package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-93
Source
CVE List V5
Source checked
Nov 11, 2026
References
4 linked sources
Open source record