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CVE-2026-53541— OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

Quick assessment

Affected
OliveTin OliveTin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OliveTin 允许用户通过 Web 界面执行预定义的 Shell 命令。执行器中的 函数本意是丢弃未在动作（action）配置中明确定义的任何参数。然而，在提交 ebffd9f040f791208aee1db2e5a8aecd1e3e603d 之前，存在一个特例：任何以 开头的参数名称均可绕过该过滤机制。 虽然 OliveTin 本身会注入两个系统级参数（ 和 ），且这些参数会被 OliveTin 覆盖重写，但用户提供的其他所有以 为前缀的参数都会原封不动地通过过滤。由于这些被绕过的参数未经过类型检查——验证循

CVSS 4.3 · Medium EPSS 0.23% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
OliveTin OliveTin <= 2025.03.07 affected
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I. Basic Information for CVE-2026-53541

Vulnerability Information
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Vulnerability Title
OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OliveTin OliveTin <= 2025.03.07 -

II. Public POCs for CVE-2026-53541

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III. Intelligence Information for CVE-2026-53541

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Patches & Fixes for CVE-2026-53541 (1)

Vendor Advisories for CVE-2026-53541 (1)

IV. Related Vulnerabilities

Same product: OliveTin
Same vendor: OliveTin
Same weakness: CWE-20

V. Comments for CVE-2026-53541

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