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cPanel EUVDEUVD-2026-51572

| CVE-2026-58047 MEDIUM
HTTP Request/Response Smuggling (CWE-444)
2026-07-31 hackerone GHSA-j5q7-f555-68qx
Information Disclosure Request Smuggling Cpanel Wp Squared
5.6
CVSS 4.0 · Vendor: hackerone
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Severity by source

Vendor (hackerone) PRIMARY
5.6 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.0 HIGH

AC:H reflects AT:P desync prerequisites; S:C and C:H/I:H capture cross-tenant credential and session impact; UI:R maps from UI:P; no availability impact reported.

3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N

Primary rating from Vendor (hackerone).

CVSS VectorVendor: hackerone

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

3
Patch available
Jul 31, 2026 - 18:02 EUVD
Analysis Generated
Jul 31, 2026 - 17:19 vuln.today
CVE Published
Jul 31, 2026 - 16:35 cve.org
MEDIUM 5.6

DescriptionCVE.org

HTTP Smuggling in cPanel allows potential leak of credentials.

AnalysisAI

HTTP request smuggling in cPanel and WP Squared (by WebPros) enables leakage of credentials from other users sharing the same hosting infrastructure. The CVSS 4.0 vector confirms network-reachable exploitation with no authentication required but with passive user interaction and attack-specific prerequisites; critically, the subsequent-system impact is rated High for both confidentiality and integrity (SC:H/SI:H), indicating that successful exploitation crosses trust boundaries to affect other users or backend components beyond the attacker's own session. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify cPanel deployment with front-end proxy
Delivery
Craft ambiguous CL/TE HTTP/1.1 request
Exploit
Submit smuggled request to front-end server
Execution
Back-end prepends attacker payload to victim's next request
Persist
Victim user submits credentials or authenticated session
Impact
Attacker receives leaked credential data
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Vulnerability AssessmentAI

Exploitation The attack requires that the cPanel deployment uses a front-end proxy (e.g., a load balancer or reverse proxy) in front of the cPanel backend application server, with both components speaking HTTP/1.1 and disagreeing on request boundary parsing (the AT:P prerequisite). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 4.0 score of 5.6 (Medium) somewhat undersells the potential real-world impact in multi-tenant deployments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker on the internet sends a specially crafted HTTP request with ambiguous Content-Length and Transfer-Encoding headers to a shared cPanel hosting server; the front-end proxy and back-end application parse the boundary differently, causing the attacker's payload to be prepended to the next request submitted by a different tenant user. When that victim user authenticates or submits a form containing credentials, those credentials are captured within the attacker's smuggled response or request context. …
Remediation Upgrade to cPanel version 138 or later, as documented in the official changelog at https://docs.cpanel.net/changelogs/138-change-log; this is the vendor-confirmed fix referenced in the security advisory at https://support.cpanel.net/hc/en-us/articles/42285024734743-Security-CVE-2026-58047-HTTP-Request-Smuggling. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-51572 vulnerability details – vuln.today
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