Vulnerability · Published Mar 12, 2026 · Assigned by GitHub_M

CVE-2026-32237@backstage/plugin-scaffolder-backend: Possible exposure of defaultEnvironment secrets using dry-run endpoint

Medium 4.4

In plain English

A medium-severity information exposure in plugin-scaffolder-backend from @backstage. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.4Medium

Exploit odds (30 days)0.3%top 82.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Backstage is an open framework for building developer portals. Prior to 3.1.5, authenticated users with permission to execute scaffolder dry-runs can gain access to server-configured environment secrets through the dry-run API response. Secrets are properly redacted in log output but not in all parts of the response payload. Deployments that have configured scaffolder.defaultEnvironment.secrets are affected. This is patched in @backstage/plugin-scaffolder-backend version 3.1.5.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@backstage/plugin-scaffolder-backend	3.1.5	GHSA-8wq8-6859-qx77

Affected products (as reported)

Vendor	Product	Versions
@backstage	plugin-scaffolder-backend	< 3.1.5

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/backstage/backstage/security/advisories/GHSA-8wq8-6859-qx77 x_refsource_CONFIRM
https://github.com/backstage/backstage/commit/3b62dd2d6bf7623ebd23e4b5a6dceb209f98dfce x_refsource_MISC