OliveTin: OS Command Injection via password argument type and webhook JSON extraction bypasses shell safety checks

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.9 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2026-27626: 0.64% estimated exploitation activity in the next 30 days; percentile 50.58 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary OliveTin's shell mode safety check (checkShellArgumentSafety) blocks several dangerous argument types but not password. A user supplying a password-typed argument can inject shell metacharacters that execute arbitrary OS commands. A second independent vector allows unauthenticated RCE via webhook-extracted JSON values that skip type safety checks entirely before reaching sh -c. Details Vector 1 — password type bypasses shell safety check (PR:L) service/internal/executor/arguments.go has two gaps: Shell execution at service/internal/executor/executorunix.go:18: A user supplies a password argument value of '; id; echo ' → sh -c interprets the shell metacharacters → arbitrary command execution. This is not the "admin already has access" pattern: OliveTin explicitly enforces an admin/user boundary where admins define commands and users only supply argument values. The password type is the documented, intended mechanism for user-supplied sensitive values. The safety check exists…

Published by the source

25 Feb 2026, 16:18 UTC

Last modified by the source

27 Feb 2026, 21:45 UTC

Source last checked

26 Oct 2026, 15:14 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-49gm-hh7w-wfvf

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# Patch Next advisory brief: CVE-2026-27626

Advisory: OliveTin: OS Command Injection via `password` argument type and webhook JSON extraction bypasses shell safety checks
IDs: CVE-2026-27626, GHSA-49gm-hh7w-wfvf
Record: https://patchnext.com/advisories/cve-2026-27626 (revision 1, source checked 26 Oct 2026, 15:14 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/OliveTin/OliveTin 0.0.0-20260222101908-4bbd2eab1532. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/OliveTin/OliveTin: affected < 0.0.0-20260222101908-4bbd2eab1532; fixed in 0.0.0-20260222101908-4bbd2eab1532

## Suggested inspection (read-only)
- Go github.com/OliveTin/OliveTin: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/OliveTin/OliveTin.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-49gm-hh7w-wfvf (GitHub-reviewed advisory GHSA-49gm-hh7w-wfvf lists affected ranges: Go github.com/OliveTin/OliveTin >=0 <0.0.0-20260222101908-4bbd2eab1532)

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