CVE-2023-43309Public exploitNetwork attack vector

Stored script execution via unescaped cron username

Published Sep 21, 2023 · Updated Sep 24, 2024

Stored XSS in Webmin 2.002 and earlier allows remote authenticated users to execute scripts via the Cluster Cron Job form. The “Execute cron job as” field accepts crafted HTML and JavaScript that the page executes instead of treating the value as text. An administrator-level Webmin session is required to store the payload, and a user must load the affected page for the script to run in that user's browser.

CVSS severity4.8
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Webmin 2.002 and earlier allows remote authenticated users to execute scripts via the Cluster Cron Job form. The “Execute cron job as” field accepts crafted HTML and JavaScript that the page executes instead of treating the value as text. An administrator-level Webmin session is required to store the payload, and a user must load the affected page for the script to run in that user's browser.

The record

CVE
CVE-2023-43309
Published
Sep 21, 2023
Updated
Sep 24, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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