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MEDIUM severity

Remote command injection when using sendmail email transportGHSA-wfrj-qqc2-83cm

MEDIUMFix: TryGhost/Ghost@93e4b2e

GHSA-wfrj-qqc2-83cm is a medium-severity (CVSS 5.8) remote code execution vulnerability in ghost. A fix is available for ghost — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Sep 17, 2021 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

7other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
ghostnpm
24Kdownloads / week

Description

Impact

Sites using the sendmail transport as part of their mail config are vulnerable to remote command injection due to a vulnerability in the nodemailer dependency.

Ghost defaults to the direct transport so this is only exploitable if the sendmail transport is explicitly used.

Patches

Fixed in 4.15.0, all sites should upgrade as soon as possible.

Workarounds

  • Use an alternative email transport as described in the docs.

For more information

If you have any questions or comments about this advisory:

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmghostall versions4.15.0npm install ghost@4.15.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ghost, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update ghost to 4.15.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wfrj-qqc2-83cm is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

### Impact Sites using the `sendmail` transport as part of their `mail` config are vulnerable to remote command injection due to a [vulnerability](https://github.com/advisories/GHSA-48ww-j4fc-435p) in the `nodemailer` dependency. Ghost defaults to the `direct` transport so this is only exploitable if the `sendmail` transport is explicitly used. ### Patches Fixed in 4.15.0, all sites should upgrade as soon as possible. ### Workarounds * Use an alternative email transport as described in the [docs](https://ghost.org/docs/config/#mail). ### For more information If you have any questions
O3 Security · Impact-Aware SCA

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Remote command injection when using sendmail email…