# CVE-2026-86516: Privilege escalation in mocknest-serverless

> Improper privilege management in the AWS GitHub OIDC deployment helper script allows remote attackers to escalate privileges.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Sep 2026
- **Updated:** 8 Sep 2026
- **Also known as:** GHSA-4h3p-r584-fm85

## What is CVE-2026-86516?

CVE-2026-86516 is a medium-severity vulnerability in elenavanengelenmaslova mocknest-serverless, published on 8 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability was detected in elenavanengelenmaslova mocknest-serverless 0.9.0. The affected element is an unknown function of the file deployment/aws/shared/github-oidc-role.yaml of the component AWS GitHub OIDC Deployment Helper Script. Performing a manipulation results in improper privilege management. It is possible to initiate the attack remotely. The patch is named 6ab3147282d867c1993f995272750db091c2290b. Applying a patch is the recommended action to fix this issue.

Weakness: CWE-269 (Improper Privilege Management), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-86516?


## How do I fix CVE-2026-86516?

No fix has been published for CVE-2026-86516 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86516 being exploited?

There is no known exploitation of CVE-2026-86516 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86516 and fix it if it is affected.

What it is: CVE-2026-86516 is a medium-severity vulnerability in elenavanengelenmaslova mocknest-serverless, published on 8 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-86516 in the wild and no public exploit code.

Affected product: elenavanengelenmaslova mocknest-serverless. 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-2026-86516/ (Markdown: https://insights.sbomify.com/CVE-2026-86516/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86516
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86516
- OSV: https://osv.dev/vulnerability/CVE-2026-86516

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86516/
Summaries are generated and may contain mistakes; the official description above is the record.