# CVE-2026-48709: OliveTin: ValidateArgumentType API Endpoint Missing Authentication Allows Action and Argument Enumeration

> Unauthenticated attackers can enumerate valid action IDs and argument configurations via the ValidateArgumentType endpoint when guest login is required.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** GHSA-f637-w7p2-m7fx, GO-2026-5347

## What is CVE-2026-48709?

CVE-2026-48709 is a low-severity missing authorization vulnerability in OliveTin, published on 15 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OliveTin gives access to predefined shell commands from a web interface. In versions 3000.0.0 and prior, The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations. This issue has been fixed in version 3000.13.0.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-48709?

3 open source packages ship an affected version, including github.com/OliveTin/OliveTin.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/OliveTin/OliveTin` | Go | All versions | 0.0.0-20260521230847-a3865704c854 |
| `github.com/OliveTin/OliveTin` | Go | All versions | 0.0.0-20260521230847-a3865704c854 |
| `github.com/OliveTin/OliveTin` | Go | All versions | 0.0.0-20260521230847-a3865704c854 |

## How do I fix CVE-2026-48709?

Upgrade github.com/OliveTin/OliveTin to 0.0.0-20260521230847-a3865704c854 or later.

## Is CVE-2026-48709 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48709 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48709 and fix it if it is affected.

What it is: CVE-2026-48709 is a low-severity missing authorization vulnerability in OliveTin, published on 15 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48709 exists.

Affected packages and fixed versions:
- github.com/OliveTin/OliveTin (Go): affected all versions; fixed in 0.0.0-20260521230847-a3865704c854
- github.com/OliveTin/OliveTin (Go): affected all versions; fixed in 0.0.0-20260521230847-a3865704c854
- github.com/OliveTin/OliveTin (Go): affected all versions; fixed in 0.0.0-20260521230847-a3865704c854

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-2026-48709/ (Markdown: https://insights.sbomify.com/CVE-2026-48709/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48709
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48709
- OSV: https://osv.dev/vulnerability/CVE-2026-48709

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48709/
Summaries are generated and may contain mistakes; the official description above is the record.