Canada's Cyber Centre relays WebPros advisories for SQL injection (CVE-2026-67401) in cPanel and two ConfigServer Firewall flaws.
The Canadian Centre for Cyber Security published advisory AV26-908 covering vulnerabilities in WebPros products, including cPanel & WHM and ConfigServer Security & Firewall (CSF). Affected cPanel builds include versions prior to 11.110.0.143, 11.134.0.55, 11.136.0.39, 11.138.0.4 and WP2 11.138.1.9, while CSF versions 14.00-16.29 (CVE-2026-65638) and 2.15-16.29 (CVE-2026-65639) are also affected. CVE-2026-67401 describes SQL injection in cPanel's EmailTrack functionality. Users and administrators are encouraged to review the advisories and apply available updates.
cPanel patched critical flaw CVE-2026-65643 letting authenticated hosting customers with addon or parked domain rights execute code as root and fully compromise servers.
cPanel issued patches on August 27, 2026 for CVE-2026-65643, a flaw in domain parking and addon domain functionality in cPanel & WHM that lets an authenticated account holder create arbitrary files and execute code as root, yielding full server control. Fixed builds cover the 11.110, 11.134, 11.136 and 11.138 branches, including WP Squared 11.138.1.7, and auto-update servers receive the fix automatically. No CVSS score, published CVE record, or evidence of exploitation has appeared, and the flaw is absent from CISA's KEV catalog as of August 27. The article also recaps related 2026 cPanel-ecosystem issues, including KEV-listed LiteSpeed plugin flaws and the in-the-wild-exploited Phusion Passenger problem.
Privilege Escalation (Possible Root) in LiteSpeed cPanel Plugin
CVE-2026-48172 is a critical privilege-escalation flaw (CWE-266, incorrect privilege assignment) in the LiteSpeed User-End cPanel plugin before 2.4.5, stemming from mishandling of the plugin's Redis enable/disable feature. It is exploitable over the network without authentication or user interaction (CVSS 4.0: AV:N/AC:L/PR:N/UI:N), and exploitation leaves traces of requests to the cPanel API's redisAble function in cPanel logs. An attacker who exploits it can elevate privileges to possibly root on the hosting server, meaning a single attacker could take control of every account and site hosted on that server. At risk are hosting providers and organizations running cPanel/WHM with the LiteSpeed cPanel plugin (and the related WHM plugin), a common premium web-server setup on multi-tenant shared-hosting platforms. The flaw was exploited in the wild in May 2026, was added to CISA's KEV catalog on 2026-05-26, and carries an EPSS of 18.9% (97th percentile); no public PoC is known.
· LiteSpeed Technologies (litespeedtech) LiteSpeed User-End cPanel Plugin before 2.4.5 (upgrade recommended to at least 2.4.7) · LiteSpeed Technologies (litespeedtech) LiteSpeed WHM Plugin listed in CPE data; no version range specified in source KEVlarge
Missing-Authentication Bypass in WebPros cPanel & WHM (AuthBypass to RCE)
CVE-2026-41940 is a critical missing-authentication flaw (CWE-306) in the login flow of WebPros cPanel & WHM (versions after 11.40) and WP2 (WordPress Squared) that lets unauthenticated remote attackers bypass authentication and gain unauthorized access to the control panel. Because no privileges, user interaction, or special conditions are required, any attacker who can reach the login endpoint over the network can attempt it. Beyond control-panel account takeover, public proofs of concept — including watchTowr's 'AuthBypass to RCE' exploit — show the flaw can be chained to remote code execution, and reporting indicates a single hosting customer could obtain root control of an entire shared server. Any hosting provider, MSP, reseller, or organization running cPanel/WHM or WP Squared is affected; cPanel is the dominant commercial hosting control panel, implying a very large installed base of shared-hosting servers and hosted domains. Exploitation is confirmed in the wild: CISA added it to the KEV on 2026-04-30 with known ransomware use, EPSS assigns a 98.5% probability of exploitation within 30 days (100th percentile), and multiple threat actors are actively exploiting it, including against government and MSP networks.
Symlink-Following Privilege Escalation in LiteSpeed cPanel Plugin Exploited in the Wild
The LiteSpeed cPanel plugin, as distributed through the LiteSpeed WHM plugin, before version 2.4.8 (WHM plugin 5.3.2.0) mishandles UNIX symbolic links supplied by users (CWE-61). An attacker who already has FTP or web shell access to any account on a shared hosting server running CloudLinux/CageFS can plant a crafted symlink that the privileged plugin follows, letting them act beyond their own account scope — reportedly gaining root control of the entire server (CVSS scope change, C:H/I:H/A:H). Any hosting provider running vulnerable versions of the LiteSpeed cPanel/WHM plugin is affected, and because this is shared hosting, a single malicious tenant endangers other customers on the same server. The flaw was exploited in the wild in May 2026, was added to CISA's Known Exploited Vulnerabilities catalog on 2026-06-15 (BOD 26-04 remediation obligations apply), and has a 1.4% 30-day EPSS; no public proof-of-concept is known.
· LiteSpeed Technologies LiteSpeed cPanel plugin before 2.4.8 · LiteSpeed Technologies LiteSpeed WHM plugin before 5.3.2.0 (ships the vulnerable cPanel plugin before 2.4.8) KEVlarge
Authenticated SQL Injection in cPanel EmailTrack Leads to Root RCE
CVE-2026-67401 is a critical SQL injection (CWE-89) in the EmailTrack component of cPanel, the widely used hosting control panel. An attacker holding any mail-enabled account on the server can reach the vulnerable component over the network with low privileges and no user interaction (CVSS: AV:N/AC:L/PR:L/UI:N), and the injection crosses a privilege boundary (Scope: Changed) to achieve remote code execution as root. Successful exploitation yields full compromise of the host — arbitrary commands as root with complete access to all hosted data — so every site, mailbox and account on an affected server is exposed. All cPanel deployments with mail enabled are potentially affected; the available data does not specify exact vulnerable version ranges, which are provided in WebPros security advisory AV26-908. Exploitation has not been confirmed in the wild (not in CISA KEV), but two public proof-of-concept exploits are already on GitHub, making near-term exploitation likely.
OS Command Injection in ConfigServer Security & Firewall (CSF) Allows Root RCE
CVE-2026-65639 is an OS command injection flaw (CWE-78, CVSS 4.0 score 9.5, critical) in the advanced-rule parser of ConfigServer Security & Firewall (CSF), a widely used Linux firewall suite. It is triggered when the parser processes rule data supplied by a configured allow/deny feed: because feed-supplied rule content is not sufficiently validated, an attacker who can control the contents of such a feed (for example by controlling or tampering with the feed source) can inject and execute arbitrary shell commands. Injected commands run as root, so successful exploitation yields full takeover of the host, with high impact to confidentiality, integrity, and availability (the CVSS AT:P metric reflects the precondition that a feed must be configured and attacker-influenced). Affected deployments include versions originally distributed by ConfigServer and versions of the WebPros-maintained fork that contain the vulnerable code; WebPros has fixed the issue in version 16.30, while other independently maintained forks may also be affected. No public proof-of-concept is known, the flaw is not in CISA KEV, and there is no confirmed exploitation in the wild at this time.
· ConfigServer Security & Firewall (CSF) - original distribution · WebPros ConfigServer Security & Firewall (CSF) - WebPros-maintained fork versions containing the vulnerable code prior to the fix; WebPros addressed the vulnerability in version 16.30mass
Unauthenticated shell command injection in ConfigServer Security & Firewall (CSF)
CVE-2026-65638 is an unauthenticated shell command injection flaw (CWE-78) in ConfigServer Security & Firewall (CSF), caused by improper escaping of a request URL. An attacker who sends a crafted request URL containing shell metacharacters to the affected web-facing component can have arbitrary commands executed under the CSF service account. Successful exploitation therefore yields command execution on the server in the context of the CSF service account, with a critical CVSS 4.0 score of 9.2 reflecting high confidentiality, integrity, and availability impact on the vulnerable system. The flaw affects versions originally distributed by ConfigServer as well as versions of the WebPros-maintained fork that contain the vulnerable code; WebPros has fixed it in version 16.30, and other independently maintained CSF forks should be evaluated separately. There is no public proof of concept, the issue is not in CISA's Known Exploited Vulnerabilities catalog, and no exploitation has been reported to date.
· ConfigServer Security & Firewall (CSF) · WebPros ConfigServer Security & Firewall (WebPros-maintained fork) Versions containing the vulnerable code; fixed in version 16.30mass
Authenticated eval injection in cPanel enables root code execution
cPanel 11.138.0.0 and earlier contains an eval injection flaw (CWE-95) in which attacker-controlled input reaches dynamic code evaluation without proper neutralization. A remote attacker holding any authenticated account on a cPanel server, such as an ordinary hosting customer, can trigger the flaw with crafted input and no user interaction. Successful exploitation yields arbitrary code execution as root, meaning a single low-privilege tenant can compromise the entire server and every site hosted on it. All deployments running version 11.138.0.0 or earlier are affected, which at disclosure covers essentially all active cPanel servers given that this was the current release. No public proof-of-concept or confirmed in-the-wild exploitation is known; the issue is not in CISA KEV and EPSS assigns only a 0.9% probability of exploitation within 30 days.
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