Backstage: Insufficient audience validation in the Cloudflare Access auth provider

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-106457 · Microsoft / collected KEV context

EUVD-2026-93990

GHSA-q333-f498-w2x7

cve-program · CVE-2026-106457

• https://github.com/backstage/backstage/security/advisories/GHSA-q333-f498-w2x7
• https://github.com/backstage/backstage/commit/ed9034cacd9def3b3674f0a764fe992f751e204d
• https://github.com/backstage/backstage/releases/tag/v1.55.0

euvd · EUVD-2026-93990

• https://github.com/backstage/backstage/security/advisories/GHSA-q333-f498-w2x7
• https://github.com/backstage/backstage/commit/ed9034cacd9def3b3674f0a764fe992f751e204d
• https://github.com/backstage/backstage/releases/tag/v1.55.0

nvd · CVE-2026-106457

• https://github.com/backstage/backstage/commit/ed9034cacd9def3b3674f0a764fe992f751e204d
• https://github.com/backstage/backstage/releases/tag/v1.55.0
• https://github.com/backstage/backstage/security/advisories/GHSA-q333-f498-w2x7

osv · GHSA-q333-f498-w2x7

• https://github.com/backstage/backstage/security/advisories/GHSA-q333-f498-w2x7
• https://nvd.nist.gov/vuln/detail/CVE-2026-106457
• https://github.com/backstage/backstage/commit/ed9034cacd9def3b3674f0a764fe992f751e204d
• https://github.com/backstage/backstage
• https://github.com/backstage/backstage/releases/tag/v1.55.0

• Backstage is an open framework for building developer portals. From 0.1.0 until 0.5.0, the @backstage/plugin-auth-backend-module-cloudflare-access-provider package is affected by insufficient audience validation in the cloudflare access aut… · Advisory content revised · 29 Oct 2026