How severe is GHSA-2g8g-63j4-9w3r?

No CVSS score has been assigned to GHSA-2g8g-63j4-9w3r yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-2g8g-63j4-9w3r?

GHSA-2g8g-63j4-9w3r affects the following packages: @backstage/plugin-scaffolder-backend (npm). Ecosystems affected: npm.

How do I fix GHSA-2g8g-63j4-9w3r?

Update @backstage/plugin-scaffolder-backend to 0.15.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2g8g-63j4-9w3r is resolved across your whole dependency graph.

How do I detect GHSA-2g8g-63j4-9w3r in my npm dependencies?

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

How do I mitigate GHSA-2g8g-63j4-9w3r if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-2g8g-63j4-9w3r?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-2g8g-63j4-9w3r can be triaged on real exposure rather than presence alone.

Is GHSA-2g8g-63j4-9w3r actively exploited in the wild?

No public exploit code has been indexed for GHSA-2g8g-63j4-9w3r yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-2g8g-63j4-9w3r published, and has it been updated?

GHSA-2g8g-63j4-9w3r was published on December 1, 2021 and was last updated on November 29, 2021. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

GHSA-2g8g-63j4-9w3r — @backstage/plugin-scaffol…

GHSA-2g8g-63j4-9w3r is a remote code execution vulnerability in @backstage/plugin-scaffolder-backend. A fix is available for @backstage/plugin-scaffolder-backend — see the affected versions and patch details below.

RCE vulnerability affecting v1beta3 templates in @backstage/plugin-scaffolder-backend

Published

Dec 1, 2021

Updated

Nov 29, 2021

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 29, 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.

69other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

@backstage/plugin-scaffolder-backendnpm

82Kdownloads / week

Description

Impact

A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template yaml definition itself and not by user input data.

Patches

This is vulnerability is patched in version 0.15.14 of @backstage/plugin-scaffolder-backend.

For more information

If you have any questions or comments about this advisory:

Open an issue in the Backstage repository
Visit our chat, linked to in Backstage README

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`@backstage/plugin-scaffolder-backend`	all versions	0.15.14`npm install @backstage/plugin-scaffolder-backend@0.15.14`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @backstage/plugin-scaffolder-backend, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @backstage/plugin-scaffolder-backend to 0.15.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2g8g-63j4-9w3r is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-2g8g-63j4-9w3r can be triaged on real exposure rather than presence alone.

Tailored to GHSA-2g8g-63j4-9w3r. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

The templating library used by the scaffolder backend assumes that templates are trusted which is an undesired property of the scaffolder-backend. This has now been mitigated by sandboxing the template code execution. ### Impact A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template yaml definition itself and not by user input data. ### Patches This is vulnerability is patched in version `0.15.14` of `@backstage/plugin-sca

O3 Security · Impact-Aware SCA

Is GHSA-2g8g-63j4-9w3r in your dependencies?

O3 Security finds GHSA-2g8g-63j4-9w3r across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works