# CVE-2026-56696: OpenHarness - Prompt Injection via /issue and /pr_comments Slash Commands

> Remote attackers can inject malicious Markdown into agent context files via slash commands, leading to persistent prompt injection and potential code execution.

- **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:** 23 Jun 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-24cw-228q-3rx9, PYSEC-2026-3880

## What is CVE-2026-56696?

CVE-2026-56696 is a medium-severity code injection vulnerability in HKUDS OpenHarness, published on 23 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OpenHarness /issue and /pr_comments slash commands lack remote_invocable=False protection, allowing remote channel senders to write attacker-controlled Markdown into project context files. Admitted remote attackers can inject malicious content into .openharness/issue.md and .openharness/pr_comments.md files, which are subsequently injected into runtime system prompts, persistently influencing local agent behavior.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-56696?

3 open source packages ship an affected version, including openharness-ai.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `openharness-ai` | PyPI | All versions to 0.1.9 | None |
| `openharness-ai` | PyPI | All versions to 0.1.9 | None |
| `openharness-ai` | PyPI | All versions to 0.1.9 | None |

## How do I fix CVE-2026-56696?

No fix has been published for CVE-2026-56696 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-56696 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56696 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56696 and fix it if it is affected.

What it is: CVE-2026-56696 is a medium-severity code injection vulnerability in HKUDS OpenHarness, published on 23 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56696 exists.

Affected packages and fixed versions:
- openharness-ai (PyPI): affected all versions up to 0.1.9; no fix listed
- openharness-ai (PyPI): affected all versions up to 0.1.9; no fix listed
- openharness-ai (PyPI): affected all versions up to 0.1.9; no fix listed

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-2026-56696/ (Markdown: https://insights.sbomify.com/CVE-2026-56696/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56696
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56696
- OSV: https://osv.dev/vulnerability/CVE-2026-56696

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-56696/
Summaries are generated and may contain mistakes; the official description above is the record.