7.7
High
CVE-2026-106498 Backstage is an open framework for building developer portals
Description
Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| backstage 1.54 | 1.54.0-next.0 → < 1.54.6 | 1.54.6 |
| backstage 1.52 | 1.52.0-next.0 → < 1.53.2 | 1.53.2 |
| backstage 1.51 | 1.51.0-next.0 → < 1.51.3 | 1.51.3 |
| backstage 1.50 | 1.50.0-next.0 → < 1.50.5 | 1.50.5 |
| backstage 1.49 | earliest → < 1.49.6 | 1.49.6 |
| plugin-catalog-backend 3.9 | 3.9.0 → < 3.9.1 | 3.9.1 |
| plugin-catalog-backend 3.8 | 3.8.0 → < 3.8.2 | 3.8.2 |
| plugin-catalog-backend 3.7 | 3.7.0 → < 3.7.2 | 3.7.2 |
| plugin-catalog-backend 3.6 | 3.6.0 → < 3.6.2 | 3.6.2 |
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| Product | Affected versions | Fixed in |
|---|---|---|
| plugin-catalog-backend 3.5 | earliest → < 3.5.1 | 3.5.1 |
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