{"schemaVersion":3,"id":"CVE-2026-53541","aliases":["GHSA-prj9-97mp-mwh2","GO-2026-5552"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-08-21T22:51:52.752Z","modified":"2026-08-24T20:03:47.277Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"github.com/OliveTin","product":"OliveTin","name":"github.com/OliveTin/OliveTin","label":"OliveTin","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/OliveTin/OliveTin","purlType":"golang","versions":[{"text":"< 0.0.0-20260531214440-ebffd9f040f7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.0.0-20260531214440-ebffd9f040f7","eol":null,"hubHref":null},{"vendor":"olivetin","product":"olivetin","name":"olivetin","label":"olivetin","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 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