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EUVD-2026-358368

fkie_cve-2026-53541

OliveTin gives access to predefined shell commands from a web interface. The `filterToDefinedArgumentsOnly` function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, prior to commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d, a special case allows any argument whose name starts with `ot_` to bypass this filter. While two system arguments (`ot_executionTrackingId` and `ot_username`) are injected by OliveTin and overridden, all other `ot_`-prefixed arguments supplied by the user pass through unmodified. These bypassed arguments are not type-checked — the validation loop only iterates over the action's defined arguments, so `ot_`-prefixed arguments skip all type safety checks entirely; set as environment variables — via `buildEnv()`, with completely unvalidated values, and passed to the executed command; and included in the template context — available as `.Arguments.ot_*` in template rendering. Commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d contains a patch.

GHSA-prj9-97mp-mwh2 — OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

Affected: Go: github.com/OliveTin/OliveTin

### Description

The `filterToDefinedArgumentsOnly` function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, a special case allows any argument whose name starts with `ot_` to bypass this filter. While two system arguments (`ot_executionTrackingId` and `ot_username`) are injected by OliveTin and overridden, all other `ot_`-prefixed arguments supplied by the user pass through unmodified.

These bypassed arguments are:

1. **Not type-checked** — the validation loop only iterates over the action's defined arguments, so `ot_`-prefixed arguments skip all type safety checks entirely. 2. **Set as environment variables** — via `buildEnv()`, with completely unvalidated values, and passed to the executed command. 3. **Included in the template context** — available as `.Arguments.ot_*` in template rendering.

### Affected Code

**Filter bypass — `service/internal/executor/executor.go` (lines 728–731):**

```go func keepArgument(name string, definedNames map[string]struct{}) bool { _, ok := definedNames[name] return ok || strings.HasPrefix(name, "ot_") } ```

**System args only override two keys — `service/internal/executor/executor.go` (lines 742–745):**

```go func injectSystemArgs(req *ExecutionRequest) { req.Arguments["ot_executionTrackingId"] = req.TrackingID req.Arguments["ot_username"] = req.AuthenticatedUser.Username } ```

Any other `ot_`-prefixed argument (e.g., `ot_malicious`) survives both fu…