# CVE-2026-25787: Cross-site scripting in SIMATIC Drive Controller CPU 1504D TF

> An authenticated attacker can inject malicious scripts into the web interface, leading to code execution in the victim's session.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 May 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-6664-q64g-w92p

## What is CVE-2026-25787?

CVE-2026-25787 is a critical cross-site scripting vulnerability in Siemens SIMATIC Drive Controller CPU 1504D TF, published on 12 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Affected devices do not properly validate and sanitize Technology Object (TO) name rendered on the "Motion Control Diagnostics" page of the web interface. This could allow an authenticated attacker who is authorized to download a TIA project into the product, to inject malicious scripts into the page.
If a benign user with appropriate rights accesses the "Motion Control Diagnostics" parameters page, the malicious code would be executed in the scope of their web session.

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

## Which versions are affected by CVE-2026-25787?


## How do I fix CVE-2026-25787?

No fix has been published for CVE-2026-25787 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-25787 being exploited?

There is no known exploitation of CVE-2026-25787 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-25787 and fix it if it is affected.

What it is: CVE-2026-25787 is a critical cross-site scripting vulnerability in Siemens SIMATIC Drive Controller CPU 1504D TF, published on 12 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-25787 in the wild and no public exploit code.

Affected product: Siemens SIMATIC Drive Controller CPU 1504D TF. 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-2026-25787/ (Markdown: https://insights.sbomify.com/CVE-2026-25787/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25787
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25787
- OSV: https://osv.dev/vulnerability/CVE-2026-25787

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-25787/
Summaries are generated and may contain mistakes; the official description above is the record.