CVE-2026-56021
Webmin information disclosure via regex pattern
Description
Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.
INFO
Published Date :
June 18, 2026, 5:16 p.m.
Last Modified :
Aug. 11, 2026, 12:17 p.m.
Remotely Exploit :
Yes !
Source :
9119a7d8-5eab-497f-8521-727c672e3725
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 9119a7d8-5eab-497f-8521-727c672e3725 | |||||
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 9119a7d8-5eab-497f-8521-727c672e3725 | ||||
| CVSS 4.0 | MEDIUM | 9119a7d8-5eab-497f-8521-727c672e3725 |
Solution
- Update Webmin to the latest version.
- Review and restrict access to .conf files.
- Apply configuration changes as per vendor advisory.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-56021.
| URL | Resource |
|---|---|
| https://github.com/webmin/webmin/releases/tag/2.641 | Product Release Notes |
| https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json | VDB Entry |
| https://webmin.com/security/#webmin-prior-to-2641 | Vendor Advisory |
| https://www.cve.org/CVERecord?id=CVE-2026-56021 | VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-56021 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-56021
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-56021 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-56021 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 11, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:webmin:webmin:*:*:*:*:*:*:*:* versions up to (excluding) 1.290 Added Reference Type Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://github.com/webmin/webmin/releases/tag/2.641 Types: Product, Release Notes Added Reference Type Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json Types: VDB Entry Added Reference Type Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://webmin.com/security/#webmin-prior-to-2641 Types: Vendor Advisory Added Reference Type Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://www.cve.org/CVERecord?id=CVE-2026-56021 Types: VDB Entry -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 24, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-56021', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-24T19:54:17.406725Z'} -
New CVE Received by 9119a7d8-5eab-497f-8521-727c672e3725
Jun. 18, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Webmin', 'product': 'Webmin', 'versions': [{'status': 'affected', 'version': '*'}], 'defaultStatus': 'unknown'}] Added SSVC {'id': 'CVE-2026-56021', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-29T20:05:32.308076Z'} Added Description Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-185 Added CWE CWE-777 Added Reference https://github.com/webmin/webmin/releases/tag/2.641 Added Reference https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json Added Reference https://webmin.com/security/#webmin-prior-to-2641 Added Reference https://www.cve.org/CVERecord?id=CVE-2026-56021