# CVE-2026-12621: Cross-Site Scripting (XSS) Vulnerability in Password Reset Redirect in GridTime™ 3000 GNSS Time Server

> An attacker can inject malicious scripts into the GridTime 3000 password reset form, potentially compromising user sessions or executing code.

- **Severity:** Medium 5.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jun 2026
- **Updated:** 29 Jun 2026
- **Also known as:** GHSA-pqrf-vgj8-cvrm

## What is CVE-2026-12621?

CVE-2026-12621 is a medium-severity cross-site scripting vulnerability in Microchip GridTime 3000, published on 19 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper neutralization of input during web page generation XSS 
vulnerability in the GridTime 3000 (password reset form) allows XSS. 
This issue affects GridTime 3000: from 1.0r0.03 before 1.2r0.0.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-12621?

It affects 1 product.


Products: Microchip Gridtime 3000 Firmware.

## How do I fix CVE-2026-12621?

No fix has been published for CVE-2026-12621 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12621 being exploited?

There is no known exploitation of CVE-2026-12621 in the wild and no public exploit code.

## Other vulnerabilities in Microchip GridTime 3000

- [CVE-2026-12622](https://insights.sbomify.com/CVE-2026-12622/): Open Redirect Vulnerability in Password Reset Submission in GridTime™ 3000 GNSS Time Server (medium 5.3)
- [CVE-2026-12619](https://insights.sbomify.com/CVE-2026-12619/): GridTime™ 3000 GNSS Time Server CSRF to XSS (medium 5.1)
- [CVE-2026-12620](https://insights.sbomify.com/CVE-2026-12620/): Access Token Exposure in URL Parameters in GridTime™ 3000 GNSS Time Server (medium 4.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12621 and fix it if it is affected.

What it is: CVE-2026-12621 is a medium-severity cross-site scripting vulnerability in Microchip GridTime 3000, published on 19 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-12621 in the wild and no public exploit code.

Affected product: Microchip GridTime 3000. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-12621/ (Markdown: https://insights.sbomify.com/CVE-2026-12621/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12621
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12621
- OSV: https://osv.dev/vulnerability/CVE-2026-12621

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12621/
Summaries are generated and may contain mistakes; the official description above is the record.