EUVD-2026-38039
GHSA-h3jc-pwm8-8fvh
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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
Network-accessible endpoint requires low-privilege session (PR:L); redirect to external site constitutes scope change (S:C); limited phishing-driven confidentiality and integrity impact (C:L/I:L); no availability impact.
Primary rating from Vendor (Microchip).
CVSS VectorVendor: Microchip
Lifecycle Timeline
1DescriptionCVE.org
The GridTime 3000 GNSS Time Server has an open redirect vulnerability in the password change form submission.
This issue affects GridTime 3000: from 1.0r0.03 through 1.1r0.0.
AnalysisAI
Open redirect in Microchip's GridTime 3000 GNSS Time Server allows authenticated low-privilege users to manipulate the post-submission redirect destination of the password change form, enabling phishing and credential harvesting attacks against administrators. All firmware versions from 1.0r0.03 through 1.1r0.0 are confirmed affected per vendor self-disclosure. No public exploit code exists and this vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog at time of analysis.
Technical ContextAI
The GridTime 3000 is a GNSS-disciplined network time server manufactured by Microchip Technology, commonly deployed in precision timekeeping roles within telecommunications, utilities, and critical infrastructure environments. The vulnerability is classified as CWE-601 (URL Redirection to Untrusted Site), where the web-based password change form handler accepts a redirect destination URL parameter without validating whether it points to a trusted, same-origin destination. Upon form submission, the server issues an HTTP redirect to the attacker-supplied URL rather than enforcing a whitelist of permitted destinations. The CVSS 4.0 base vector (AV:N/AC:L/AT:N/PR:L/UI:N) confirms the endpoint is network-accessible, requires no special attack conditions, and is reachable by any authenticated low-privilege session. Affected products are identified by CPE cpe:2.3:a:microchip:gridtime_3000 across versions 1.0r0.03 through 1.1r0.0.
RemediationAI
Consult the Microchip security advisory at https://www.microchip.com/en-us/solutions/technologies/embedded-security/how-to-report-potential-product-security-vulnerabilities/gridtime-3000-gnss-time-server-open-redirect to obtain the patched firmware version - an exact fixed firmware version number is not independently confirmed from the available data and must be verified directly with Microchip. As a compensating control prior to patching, restrict access to the GridTime 3000 web management interface using firewall ACLs or VLAN segmentation so that only authorized administrators on trusted management networks can reach the interface, reducing the pool of authenticated users who could be targeted by or trigger the redirect. Additionally, train operators managing GNSS time servers to scrutinize post-form-submission redirects and avoid entering credentials on pages reached via device-hosted links. Isolation of the management plane carries no operational side effects on timekeeping functions.
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