CVE-2026-34234
CriticalExploitedPublic exploitCtrlPanel: Unauthenticated RCE using installer script
Published May 19, 2026 · Updated Aug 12, 2026 · Also known as GHSA-jmhr-q9q5-fqwh
Key Facts
Patch immediately- CVE-2026-34234 is a critical-severity vulnerability (CVSS 10.0 v3.1) affecting panel.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since May 19, 2026. Public exploit code is available.
- EPSS estimates a 4.5% 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 it is listed as exploited in the wild.
CVSS v3.1
10.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
4.5%
Higher than 91.4% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-34234 brief as a PDF
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Description
CtrlPanel is open-source billing software for hosting providers. In versions 1.1.1 and prior, the web-based installer (public/installer/index.php) is vulnerable to unauthenticated Remote Code Execution (RCE) because it performs the install.lock check only after including and executing form handler files, leaving installer endpoints reachable on already-installed instances. The handlers also pass unsanitized user input directly into shell commands, allowing an attacker to submit crafted requests that execute arbitrary commands on the server. The vulnerability stems from two combined weaknesses: (1) premature form handler execution before the lock file gate, and (2) unsafe use of user input in shell command construction. This issue is reported to be actively exploited in the wild. The issue has been fixed in version 1.2.0.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | May 19, 2026 | n/a | Not reported |
| CIRCL KEV | Jun 1, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| panel | >= < 1.2.0 | n/a |
Timeline
Publicly disclosed
May 19, 2026
Added to Industry KEV feed
May 19, 2026
Added to CIRCL KEV
Jun 1, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
- CWE-284 Improper Access Control
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34234.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-34234
- exploitVulnCheck exploitation report
- otherhttps://github.com/Ctrlpanel-gg/panel/releases/tag/1.2.0
- otherhttps://github.com/Ctrlpanel-gg/panel/security/advisories/GHSA-jmhr-q9q5-fqwh
FAQ
Common Questions.
CtrlPanel is open-source billing software for hosting providers.
Affected: panel versions >= < 1.2.0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since May 19, 2026.
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 it is listed as exploited in the wild.
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