CVE-2021-31761Webmin XSS
Webmin 1.973 is affected by reflected Cross Site Scripting (XSS) to achieve Remote Command Execution through Webmin's running process feature.
Published Apr 26, 2021 · Updated Aug 7, 2026
Key Facts
Patch immediately- CVE-2021-31761 is a critical-severity vulnerability (CVSS 9.6 v3.1) affecting Webmin.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 34% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
34%
Higher than 98.3% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
49/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisoryhttps://github.com/electronicbots/CVE-2021-31761
- advisoryhttps://github.com/Mesh3l911/CVE-2021-31761
- advisoryhttp://172.19.9.3/vdb/cvss3.1/#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C
- advisoryhttps://github.com/webmin/webmin
- advisoryhttps://www.cybersecurity-help.cz/exploits/52551/?ref=bulletin
- advisoryhttps://www.cybersecurity-help.cz/vdb/SB2021042554
Description
Webmin 1.973 is affected by reflected Cross Site Scripting (XSS) to achieve Remote Command Execution through Webmin's running process feature.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WebminWebmin | 1.973 | n/a |
Timeline
Publicly disclosed
Apr 26, 2021
Last updated
Aug 7, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisorygithub.com · CVE-2021-31761
- advisorygithub.com · CVE-2021-31761
- advisory172.19.9.3 · cvss3.1
- advisorygithub.com · webmin
- advisorycybersecurity-help.cz · 52551
FAQ
Common Questions.
Webmin 1.973 is affected by reflected Cross Site Scripting (XSS) to achieve Remote Command Execution through Webmin's running process feature.
Affected: Webmin versions 1.973. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2021-31761 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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