CVE-2011-4810: Multiple directory traversal vulnerabilities in WHMCompleteSolution (WHMCS) 3.x and 4.x allow remote attackers

This month

MEDIUM 5.0DOWNGRADE

CVE-2011-4810 is a medium-severity flaw (CVSS 5.0) affecting whmcompletesolution. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple directory traversal vulnerabilities in WHMCompleteSolution (WHMCS) 3.x and 4.x allow remote attackers to read arbitrary files via the templatefile parameter to (1) submitticket.php and (2) downloads.php, and (3) the report parameter to admin/reports.php.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	6.3% (top 6%)
CISA exploited list	No
Weakness	CWE-22
Published	2011-12-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: whmcs

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2011-12-14 00:55 UTCPublished CVE record published
2026-06-16 23:35 UTCUpdated Record last modified

whmcs whmcompletesolution DOWNGRADE

Affected: 3.0.0 · 4.0.0 · 4.0.1 · 4.0.2 · 4.1.0 · 4.1.1 · 4.1.2 · 4.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy whmcompletesolution || rpm -q whmcompletesolution || whmcompletesolution --version

2. No fixed release: DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison whmcompletesolution sudo apt install whmcompletesolution=<VERSION_BEFORE_3.0.0> sudo apt-mark hold whmcompletesolution

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

dnf --showduplicates list whmcompletesolution sudo dnf downgrade whmcompletesolution-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add whmcompletesolution

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: WHMCompleteSolution 3.x/4.x - Multiple Vulnerabilities

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-2011-4810?

whmcompletesolution: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-4810 being exploited?

CVE-2011-4810 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-2011-4810 affect?

CVE-2011-4810 affects whmcompletesolution. Severity is medium (CVSS 5.0). Multiple directory traversal vulnerabilities in WHMCompleteSolution (WHMCS) 3.x and 4.x allow remote attackers to read arbitrary files via the templatefile parameter to (1) submitticket.php and (2) downloads.php, and (3) the report paramete

How urgent is CVE-2011-4810?

Priority 46/100. EPSS top 6%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

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References

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