EUVD-2026-40033
GHSA-63j7-9hp3-gp4j
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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
Network-delivered reflected XSS with no required privileges; scope changes to browser context giving limited confidentiality and integrity impact; user interaction mandatory to trigger.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
3DescriptionCVE.org
A vulnerability has been found in GotoHTTP up to 10.2. This issue affects some unknown processing of the file /reg.12x. The manipulation of the argument sn leads to cross site scripting. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor explains: "We immediately removed unnecessary parameter echo from source code. However the URL in the issue description will never be used in browser nor exposed to user, so it will not bring secure problem in fact. So we don't upgrade server right now, it will be included in next version together with other features."
AnalysisAI
Reflected cross-site scripting in GotoHTTP up to version 10.2 allows remote attackers to inject arbitrary JavaScript via the sn parameter in the /reg.12x endpoint. A publicly available proof-of-concept exploit exists (GitHub issue linked in references). The vendor has acknowledged the flaw and removed the parameter echo from source code, but explicitly declined to release a patched build immediately, stating the affected URL is not normally surfaced in a browser or exposed to end users - a claim that partially limits real-world risk but does not eliminate it. No active exploitation confirmed (not in CISA KEV); however, the public POC lowers the bar for abuse.
Technical ContextAI
GotoHTTP is a lightweight HTTP-based remote access tool (CPE: cpe:2.3:a:n/a:gotohttp:*:*:*:*:*:*:*:*). The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation - Cross-Site Scripting), specifically a reflected XSS variant. The /reg.12x registration or registration-adjacent endpoint improperly echoes the user-supplied sn parameter directly into the HTTP response without sanitization or encoding. When a victim's browser renders the response, the injected script executes in the context of the GotoHTTP web origin. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P) confirms network accessibility with no special attack prerequisites beyond victim user interaction.
RemediationAI
No patched release has been published at time of analysis - vendor-released patch not independently confirmed. The vendor has stated that the unnecessary parameter echo was removed from source code and will be included in the next version. Organizations relying on GotoHTTP should monitor the vendor's release channel for an updated build and upgrade immediately upon availability. As a compensating control, restrict access to the GotoHTTP web interface to trusted internal networks only - blocking public internet access to the /reg.12x endpoint via firewall or reverse-proxy ACL eliminates the network attack vector entirely. Additionally, deploying a web application firewall rule to reject requests to /reg.12x containing script-pattern characters in the sn parameter provides an additional layer without disabling the service. Note: the vendor asserts this endpoint is not user-facing; verify this in your specific deployment before treating it as a complete mitigation.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
Leaving vuln.today