Is CVE-2026-12621 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-12621 being exploited in the wild.

How severe is CVE-2026-12621?

Informational severity, with a CVSS score of 5.3, published 19 June 2026.

Which products and versions are affected?

Microchip Technology GridTime 3000 GNSS Time Server 1.0r0.03 to 1.1r0.0.

Is there a fix for CVE-2026-12621?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-12621 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-12621?

Check whether you run Microchip Technology GridTime 3000 GNSS Time Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-12621: Microchip GridTime 3000 XSS in password reset form

CVE-2026-12621 · Severity: info · CVSS 5.3 · Published 2026-06-19

The Microchip GridTime 3000, a high-precision time server used in critical infrastructure, contains a security flaw in its password reset interface. An attacker with low-level access could inject malicious scripts into the web management console. This could lead to unauthorized actions being performed in the context of other users' sessions, potentially compromising the management of the timing device.

Technologies: Microchip Technology GridTime 3000 GNSS Time Server. Vendors: Microchip Technology.

Quick answers

Is CVE-2026-12621 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-12621 being exploited in the wild.
How severe is CVE-2026-12621?: Informational severity, with a CVSS score of 5.3, published 19 June 2026.
Which products and versions are affected?: Microchip Technology GridTime 3000 GNSS Time Server 1.0r0.03 to 1.1r0.0.
Is there a fix for CVE-2026-12621?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-12621 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-12621?: Check whether you run Microchip Technology GridTime 3000 GNSS Time Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Cross-Site Scripting (XSS) vulnerability exists in the password reset form of the Microchip GridTime 3000 GNSS Time Server. The vulnerability stems from improper neutralization of user-supplied input during web page generation. An attacker with low privileges (PR:L) can exploit this over the network to execute arbitrary JavaScript in the context of a victim's browser session. The issue affects firmware versions from 1.0r0.03 through 1.1r0.0 and is addressed in version 1.2r0.0.

Affected products

Microchip Technology GridTime 3000 GNSS Time Server 1.0r0.03 to 1.1r0.0

Timeline

2026-06-19: disclosed
2026-06-19: advisory

References

https://www.microchip.com/en-us/solutions/technologies/embedded-security/how-to-report-potential-product-security-vulnerabilities/gridtime-3000-gnss-time-server-dom-xss

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