Backstage is an open framework for building developer portals. An attacker with control of the contents of the TechDocs storage buckets is able to inject executable scripts in the TechDocs content that will be executed in the victim's browser when browsing documentation or navigating to an attacker provided link. This has been fixed in the 1.10.13 release of the `@backstage/plugin-techdocs-backend` package. users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected: npm: @backstage/plugin-techdocs-backend

### Impact

An attacker with control of the contents of the TechDocs storage buckets is able to inject executable scripts in the TechDocs content that will be executed in the victim's browser when browsing documentation or navigating to an attacker provided link.

### Patches

This has been fixed in the 1.10.13 release of the `@backstage/plugin-techdocs-backend` package.

### References

If you have any questions or comments about this advisory:

Open an issue in the [Backstage repository](https://github.com/backstage/backstage) Visit our Discord, linked to in [Backstage README](https://github.com/backstage/backstage)

http-proxy-middleware: http-proxy-middleware: Denial of Service via unhandled error during path matching cross-spawn: regular expression denial of service path-to-regexp: Backtracking regular expressions cause ReDoS body-parser: Denial of Service Vulnerability in body-parser plugin-catalog-backend: prototype pollution vulnerability plugin-techdocs-backend: storage bucket directory traversal in TechDocs plugin-techdocs-backend: circumvention of XSS protection in TechDocs backstage/plugin-app-backend: Unexpected visibility of environment variable configurations in @backstage/plugin-app-backend