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Medium

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-53541
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 06:08 UTC · Revision 1

Source evidence

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

core-osv · Original source

Published 21 Aug 2026, 22:51 UTC

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.

osv:CVE-2026-53541
Complete source record
{
  "id": "ce24cfd0236399962483040dd59b072df469887be939af0ec8e8ac3258f6cbd3",
  "url": "https://osv.dev/vulnerability/CVE-2026-53541",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering",
    "summary": "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.",
    "evidence": "osv:CVE-2026-53541",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-53541",
      "aliases": [
        "CVE-2026-53541",
        "GHSA-prj9-97mp-mwh2",
        "GO-2026-5552"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/olivetin/olivetin",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ebffd9f040f791208aee1db2e5a8aecd1e3e603d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
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                        "introduced": "0"
                      },
                      {
                        "fixed": "ebffd9f040f791208aee1db2e5a8aecd1e3e603d"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ebffd9f040f791208aee1db2e5a8aecd1e3e603d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
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            "2021-11-17-2",
            "2021-11-17",
            "2021-11-02.alpha1-task-arguments",
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            "2021-05-24.f44",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53541.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.184476086Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53541.json",
        "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-prj9-97mp-mwh2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53541",
        "https://github.com/OliveTin/OliveTin/commit/ebffd9f040f791208aee1db2e5a8aecd1e3e603d"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "2025.03.07"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53541.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53541",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492940,
  "published_at": "2026-08-21T22:51:52.752+00:00"
}