# CVE-2026-104629: Grid Protection Alliance openPDC and openHistorian Use of Externally-Controlled Input to Select Classes or Code

> Authenticated attackers can execute arbitrary code by placing files on the host, leading to privilege escalation within the openPDC and openHistorian services.

- **Severity:** High 7.7 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/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:** 9 Oct 2026
- **Updated:** 9 Oct 2026
- **Also known as:** GHSA-68jv-q5j2-rgqm

## What is CVE-2026-104629?

CVE-2026-104629 is a high-severity code injection vulnerability in Grid Protection Alliance openHistorian, published on 9 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A component loading mechanism in openPDC and openHistorian will construct and run any specified type, which may be an invalid component to load. An attacker with an authenticated user account and the ability to place a file on the host filesystem can use this to run arbitrary constructor code, and this code runs with the privileges of the affected service account.

Weakness: CWE-470 (Use of Externally-Controlled Input to Select Classes or Code)

## Which versions are affected by CVE-2026-104629?


## How do I fix CVE-2026-104629?

No fix has been published for CVE-2026-104629 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104629 being exploited?

There is no known exploitation of CVE-2026-104629 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104629 and fix it if it is affected.

What it is: CVE-2026-104629 is a high-severity code injection vulnerability in Grid Protection Alliance openHistorian, published on 9 Oct 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-2026-104629 in the wild and no public exploit code.

Affected product: Grid Protection Alliance openHistorian. 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-2026-104629/ (Markdown: https://insights.sbomify.com/CVE-2026-104629/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104629
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104629
- OSV: https://osv.dev/vulnerability/CVE-2026-104629

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104629/
Summaries are generated and may contain mistakes; the official description above is the record.