Applications

CVE-2026-125391

Authenticated OS command injection in Webmin samba user options allowing root command execution.

Major vulnerability. Webmin is a widely used server administration tool; authenticated command injection leading to root on many Unix hosts can cause broad operational impact and warrants org-wide attention.

CVSS: 8.6Highscored by the publisher (CNA)
Exploited in the wild: Not knownnot in CISA KEV as of our last sync
EPSS: No score yet
Fix: Patch availablesee the advisories in the references
Published: 9 Nov 2026analysed here 12 Nov 2026

Summary

Impact

Authenticated Samba user maintainer can inject shell metacharacters via opts to execute arbitrary commands as root on the Webmin host.

Triage

Attack surface: Server-side
Exploitable: At runtime
Attack vector: network
Weakness: CWE-78 OS Command Injection
Can a WAF block it?: Partly. See why

The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.

Affected products

Product	Affected versions	Vendor says fixed in
webmin	<= 2.670Vendor says fixed in: not stated	Not stated by the vendor

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

Products named in our analysis

Webmin <= 2.670
samba/save_euser.cgi
Unix/Linux hosts running Webmin

Fix and mitigation

Action required

Immediate action required

WAF and other mitigations

Can a WAF block it? Partly. OS command injection puts shell syntax into the request. WAF rules catch common shell commands but miss encoded or unusual payloads.

Also consider: shlex/execve-style APIs

Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

Remediation steps (AI-written)

Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.

Exploitation evidence

CISA KEV catalog: Not listed as of our last sync.
Public exploit code: None on record in Exploit-DB, Metasploit, Nuclei templates or PoC-in-GitHub.
CISA SSVC: exploitation none, automatable no, technical impact totalAssessed by CISA 10 Nov 2026 (SSVC 2.0.3). Exploitation is none, poc (public proof of concept) or active.

Timeline

9 Nov 2026Published
10 Nov 2026CISA SSVC assessment: exploitation none1 day later
10 Nov 2026CVE record last updatedsame day later
12 Nov 2026Analysed by vulneraibility.com2 days later

Common questions

Is CVE-2026-125391 being exploited?

Not confirmed. CVE-2026-125391 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.

How severe is CVE-2026-125391?

CVE-2026-125391 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-125391?

Yes. A fix has been recorded for CVE-2026-125391. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-125391 affect?

CVE-2026-125391 affects Webmin <= 2.670, samba/save_euser.cgi, Unix/Linux hosts running Webmin. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-125391?

Apply the vendor patch/update immediately; restrict Webmin access and audit affected accounts.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

References

NVD CVE.org CVE Details Source

4 references in the CVE record, grouped by the tags the record gives them.

Advisories (1)

vulncheck.com /advisories/webmin-through-2.670-os-command-injection-via-samba-user-account-opt

Patches (1)

github.com /webmin/webmin/commit/18cab89b1fc74ab7e8b1b8b90bbccbe5aba99154

Where the data on this page comes from

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile

Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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