CVE-2021-41878: A reflected cross-site scripting (XSS) vulnerability exists in the i-Panel Administration System Version 2.0 t

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MEDIUM 6.1DOWNGRADE

CVE-2021-41878 is a medium-severity flaw (CVSS 6.1) affecting i-panel administration system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected cross-site scripting (XSS) vulnerability exists in the i-Panel Administration System Version 2.0 that enables a remote attacker to execute arbitrary JavaScript code in the browser-based web console and it is possible to insert a vulnerable malicious button.

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	9.9% (top 4%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-10-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hkurl

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-10-04 12:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

hkurl i-panel administration system DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy i-panel-administration-system || rpm -q i-panel-administration-system || i-panel-administration-system --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison i-panel-administration-system sudo apt install i-panel-administration-system=<VERSION_BEFORE_2.0> sudo apt-mark hold i-panel-administration-system

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list i-panel-administration-system sudo dnf downgrade i-panel-administration-system-<VERSION_BEFORE_2.0> sudo dnf versionlock add i-panel-administration-system

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: i-Panel Administration System 2.0 - Reflected Cross-site Scripting (XSS)
Nuclei scan template: i-Panel Administration System 2.0 - Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-41878?

i-panel administration system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-41878 being exploited?

CVE-2021-41878 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-41878 affect?

CVE-2021-41878 affects i-panel administration system. Severity is medium (CVSS 6.1). A reflected cross-site scripting (XSS) vulnerability exists in the i-Panel Administration System Version 2.0 that enables a remote attacker to execute arbitrary JavaScript code in the browser-based web console and it is possible to insert a

How urgent is CVE-2021-41878?

Priority 50/100. EPSS top 4%: very likely to be exploited; Public exploit reference

References

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