CVE-2021-43681Network attack vector

Cross-site scripting via unsanitized proxy_name output

Published Dec 2, 2021 · Updated Aug 4, 2024

Cross-site scripting in SakuraPanel 1.0.1.1 allows remote attackers to inject script through crafted proxy_name data submitted to PostHandler.php. The checkRules function passes attacker-controlled proxy_name data into an error message, and PostHandler.php prints that message with exit without HTML escaping. Exploitation requires a victim to voluntarily interact with the crafted request or resulting page, allowing script execution in the victim's browser with limited confidentiality and integrity impact.

CVSS severity6.1
Medium
EPSS probability0.62%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in SakuraPanel 1.0.1.1 allows remote attackers to inject script through crafted proxy_name data submitted to PostHandler.php. The checkRules function passes attacker-controlled proxy_name data into an error message, and PostHandler.php prints that message with exit without HTML escaping. Exploitation requires a victim to voluntarily interact with the crafted request or resulting page, allowing script execution in the victim's browser with limited confidentiality and integrity impact.

The record

CVE
CVE-2021-43681
Published
Dec 2, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo