CVE-2023-40285Public exploitNetwork attack vector

Administrator account creation via unsanitized language cookie

Published Mar 27, 2024 · Updated Dec 6, 2024

Stored XSS in Supermicro X11SSM-F, X11SAE-F, and X11SSE-F firmware 1.66 allows remote attackers to create an administrator account. Multiple authenticated web pages pass the language cookie into document.write without sanitization, injecting attacker-controlled JavaScript. Exploitation requires poisoning an administrator's cookie and inducing that administrator to load a vulnerable page; the script then uses the session's CSRF token to create the account.

CVSS severity8.3
High
EPSS probability0.57%
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 Supermicro X11SSM-F, X11SAE-F, and X11SSE-F firmware 1.66 allows remote attackers to create an administrator account. Multiple authenticated web pages pass the language cookie into document.write without sanitization, injecting attacker-controlled JavaScript. Exploitation requires poisoning an administrator's cookie and inducing that administrator to load a vulnerable page; the script then uses the session's CSRF token to create the account.

The record

CVE
CVE-2023-40285
Published
Mar 27, 2024
Updated
Dec 6, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.6BinarlyCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
8.3SupermicroCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1136Create Account

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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