Backstage is an open framework for building developer portals. Prior to 3.9.2 and from 4.0.0 until 4.0.2, DefaultCatalogRulesEnforcer in @backstage/plugin-catalog-backend compares the raw location.target URL against catalog.rules, while URL readers canonicalize the same URL befor...
Vendor
backstage vulnerabilities
76 published CVES affecting backstage, from public sources (CVE.org, NVD, CISA KEV, FIRST EPSS, OSV).
- Total
- 76
- Critical
- 4
- High
- 20
- Medium
- 46
- Low
- 4
- Unscored
- 2
- CISA KEV
- 0
Products
- backstage 69
- @backstage/plugin-scaffolder-backend 17
- @backstage/plugin-techdocs-node 12
- backend-defaults 6
- plugin-catalog-backend 6
- @backstage/plugin-auth-backend 4
- plugin-techdocs-backend 4
- @backstage/techdocs-common 3
- plugin-kubernetes-backend 3
- @backstage/plugin-scaffolder-node 2
- plugin-proxy-backend 2
- plugin-scaffolder-backend-module-bitbucket-cloud 2
- plugin-scaffolder-backend-module-bitbucket-server 2
- plugin-scaffolder-backend-module-confluence-to-markdown 2
- @backstage/backend-app-api 1
- @backstage/backend-common 1
- @backstage/catalog-model 1
- @backstage/cli-common 1
- @backstage/core-components 1
- @backstage/integration 1
- @backstage/plugin-app-backend 1
- @backstage/plugin-permission-backend 1
- @backstage/plugin-techdocs 1
- plugin-auth-backend-module-cloudflare-access-provider 1
- plugin-auth-backend-module-oidc-provider 1
- plugin-auth-node 1
- plugin-catalog-backend-module-aws 1
- plugin-catalog-backend-module-azure 1
- plugin-catalog-backend-module-bitbucket-server 1
- plugin-catalog-backend-module-gitlab 1
Latest backstage CVEs
Newest publication first · page 1 of 4
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MediumCVSS 6.5
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MediumCVSS 4.3 EPSS 0.24%
Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper access control in backend action invocation. An authenticated user could invoke actions that an operator had excluded through action con...
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CVE-2026-106557 Backstage: Improper input validation in TechDocs Markdown extension configuration
PublishedHighCVSS 7.7 EPSS 0.38%Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources m...
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CVE-2026-106563 Backstage: Improper entity validation in deprecated Kubernetes services endpoint
PublishedMediumCVSS 6.5 EPSS 0.22%Backstage is an open framework for building developer portals. Prior to 0.21.8, the @backstage/plugin-kubernetes-backend package is affected by improper entity validation in deprecated kubernetes services endpoint. An authenticated user with Kubernetes read permissions could acce...
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MediumCVSS 4.3 EPSS 0.20%
Backstage is an open framework for building developer portals. Prior to 2.1.6 in @backstage/plugin-search-backend and 1.8.7 in @backstage/plugin-search-backend-module-elasticsearch, search engine permission filtering could return documents denied by policy. An authenticated Backs...
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CVE-2026-106561 Backstage: Sensitive information disclosure in Kubernetes resource queries
PublishedMediumCVSS 5.0 EPSS 0.20%Backstage is an open framework for building developer portals. Prior to 0.21.9, the @backstage/plugin-kubernetes-backend package is affected by sensitive information disclosure in kubernetes resource queries. An authenticated user holding the standard Kubernetes resource read per...
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CVE-2026-106560 Backstage: Improper repository path validation in a Scaffolder backend module
PublishedMediumCVSS 6.5 EPSS 0.31%Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper repository path validation in a scaffolder backend module. An authenticated user who can execute...
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CVE-2026-106559 Backstage: Improper input validation in Confluence to Markdown scaffolder module
PublishedMediumCVSS 6.5 EPSS 0.33%Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper input validation in confluence to markdown scaffolder module. Insufficient input validation in th...
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HighCVSS 8.8 EPSS 0.47%
Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-back...
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HighCVSS 7.7 EPSS 0.26%
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could al...
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HighCVSS 7.7 EPSS 0.48%
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by remote code execution via crafted markdown_extensions in techdocs mkdocs.yml. An authenticated user who can register catalog entities can pro...
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HighCVSS 8.8 EPSS 0.52%
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container,...
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MediumCVSS 6.5 EPSS 0.39%
Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: 'local'), it was...
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MediumCVSS 6.5 EPSS 0.39%
Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by techdocs arbitrary file read via mkdocs snippets. Unsafe path resolution in TechDocs source tree handling allows an authenticated user who ca...
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MediumCVSS 5.3 EPSS 0.22%
Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant s...
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HighCVSS 8.5 EPSS 0.31%
Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses T...
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MediumCVSS 6.5 EPSS 0.26%
Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to obs...
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HighCVSS 8.1 EPSS 0.49%
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates...
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CVE-2026-106502 Backstage: Sensitive information may be exposed in Scaffolder task failure events
PublishedMediumCVSS 5.3 EPSS 0.29%Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose sensitive information in Scaffolder task failure events. Under specific template and failure conditions, an authenticated user may retrieve...
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CriticalCVSS 9.6 EPSS 0.48%
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffol...
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HighCVSS 8.5 EPSS 0.34%
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper task state validation in scaffolder backend. An authenticated user with permission to create and access...
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MediumCVSS 4.9 EPSS 0.27%
Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an atta...
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CVE-2026-106498 Backstage: Improper URL validation in catalog entity placeholder resolution
PublishedHighCVSS 7.7 EPSS 0.31%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...
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MediumCVSS 4.3 EPSS 0.19%
Backstage is an open framework for building developer portals. Prior to 3.9.1, the @backstage/plugin-catalog-backend package is affected by inconsistent catalog property permission evaluation. In deployments that use affected value-based catalog permission conditions as a confide...
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MediumCVSS 6.5 EPSS 0.24%
Backstage is an open framework for building developer portals. Prior to 3.9.1, the @backstage/plugin-catalog-backend package is affected by inconsistent enforcement of allowed location types during catalog processing. Under certain configurations, the catalog backend could proces...
Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.