GHSA-wrvw-254r-wpmvPublished

CliInvoke.Specializations: Command injection in PowerShell and Cmd shell wrappers

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-100368

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 0.58 % · percentile 48.10 % · scored 10 Nov 2026.

Observed 10 Nov 2026 20:24:10 UTC · Complete immutable risk JSON

cve-program · CVE-2026-100368

Published

CliInvoke is a .NET library for invoking command-line programs, and its `CliInvoke.Specializations` packages provide specialized wrappers for shells such as PowerShell and Windows Command Prompt. `CliInvoke.Specializations` versions 2.2.0 through 2.8.4, 2.9.0 through 2.9.3, 2.10.0 through 2.10.4, 3.0.0-alpha.1 through 3.0.0-alpha.4, and 3.0.0-alpha.8 through 3.0.0-alpha.10, as well as `AlastairLundy.CliInvoke.Specializations` versions 1.0.0-rc.1 through 1.6.1.1, contain an OS command injection vulnerability in their PowerShell and Cmd wrappers. The wrappers pass a caller-controlled target and arguments to `pwsh -Command` or `cmd /c` using a single `ProcessStartInfo.Arguments` string, allowing a double quote in untrusted input to break operating-system-level quoting and cause the shell to execute an additional command with the host process's privileges. The vulnerability is patched in `CliInvoke.Specializations` versions 2.8.5, 2.9.4, 2.10.5, and 3.0.0-beta.1, and in `AlastairLundy.CliInvoke.Specializations` version 2.0.2. No complete workaround is available; users unable to upgrade should reject or remove double quotes from target paths and arguments, additionally reject shell metacharacters in versions 2.2.0 through 2.9.2 and 3.0.0-alpha.1 through 3.0.0-alpha.4, or bypass the PowerShell and Cmd wrappers and invoke target processes directly when handling untrusted input.

Source published: 25 Sep 2026 19:53:56 UTC
Source modified: 30 Sep 2026 00:06:47 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

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CVSS 3.1 · 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

euvd · EUVD-2026-87320

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 25, 2026, 7:53:56 PM

dateUpdated: Sep 30, 2026, 12:06:47 AM

Source published: Sep 25, 2026, 7:53:56 PM (timezone not stated)
Source modified: Sep 30, 2026, 12:06:47 AM (timezone not stated)
Observed here: 11 Nov 2026 04:39:45 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd · CVE-2026-100368

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-78

Original publisher date fields

published: 2026-09-25T20:17:05.990

lastModified: 2026-09-30T19:57:08.043

Source published: 25 Sep 2026 20:17:05 UTC
Source modified: 30 Sep 2026 19:57:08 UTC
Observed here: 25 Oct 2026 04:17:26 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

osv · GHSA-wrvw-254r-wpmv

Published

### Impact An OS command injection vulnerability exists in the PowerShell and Cmd shell wrappers provided by the `CliInvoke.Specializations` package (the `PowershellProcessInvoker`/`CmdProcessInvoker` invokers, and the `UsePowerShell`/`UseCmd` middleware in v3 pre-release versions). The wrappers re-run a caller-supplied target and arguments inside a shell command (`pwsh -Command ...` / `cmd /c ...`). In affected versions the wrapped command was delivered to the operating system as a single `ProcessStartInfo.Arguments` string. The OS command-line parser re-tokenizes that string before the shell parses it, so a double quote (`"`) in the target or arguments breaks OS-level quoting and lets the wrapped shell reassemble a second, unintended command. An attacker could exploit this to execute arbitrary commands with the privileges of the host process. ### Patches The Specializations Packages now deliver the command via `ProcessStartInfo.ArgumentList` (natively where supported, and polyfilled in older TFMs), so that the operating system passes argv verbatim and only the shell parses the command once. Upgrade to: - **2.8.5** (2.8.x line) - **2.9.4** (2.9.x line) - **2.10.5** (2.10.x line) - **3.0.0-beta.1** (3.x pre-release line) ### Workarounds No complete workaround is available. Until upgraded: - Reject or strip `"` from any target path or argument passed to the PowerShell/Cmd wrappers. On 2.2.0 – 2.9.2 and 3.0.0-alpha.1 – alpha.4, also reject shell metacharacters (`;`, `|`, `&`, `$`, backtick, parentheses). - Alternatively, bypass the wrappers for untrusted input and invoke the target process directly so that no second shell parse of the data occurs.

Source published: 25 Sep 2026 21:41:48 UTC
Source modified: 25 Sep 2026 23:00:31 UTC
Observed here: 23 Oct 2026 16:01:25 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Publisher rating · HIGH