Backstage up to 0.6.14/0.7.4 OAuth Profile Normalization improper authentication

Summaryinfo

A vulnerability described as critical has been identified in Backstage up to 0.6.14/0.7.4. This affects an unknown part of the component OAuth Profile Normalization. The manipulation results in improper authentication. This vulnerability is identified as CVE-2026-106460. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Backstage up to 0.6.14/0.7.4. It has been classified as critical. Affected is an unknown code block of the component OAuth Profile Normalization. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Backstage is an open framework for building developer portals. From 0.3.0 until 0.6.15 and 0.7.5, the @backstage/plugin-auth-node package did not consistently honor explicit negative email verification during shared OAuth profile normalization. The affected paths include a selected profile email marked verified: false, a matching raw provider email marked email_verified: false, and an email obtained only from an ID token marked email_verified: false. Exploitation requires an admitted identity-provider user who can supply or change an unverified email and a deployment that uses the selected profile email to resolve catalog identities. The verification metadata must apply to the selected email; an absent email_verified claim alone is not affected. In an affected configuration, the user may assume another catalog identity and obtain its associated access and permissions. This issue is fixed in versions 0.6.15 and 0.7.5.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-106460 since 10/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.6.15 or 0.7.5 eliminates this vulnerability.

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Productinfo

Name

• Backstage

Version

• 0.6.0
• 0.6.1
• 0.6.2
• 0.6.3
• 0.6.4
• 0.6.5
• 0.6.6
• 0.6.7
• 0.6.8
• 0.6.9
• 0.6.10
• 0.6.11
• 0.6.12
• 0.6.13
• 0.6.14
• 0.7.0
• 0.7.1
• 0.7.2
• 0.7.3
• 0.7.4

Website

• Product: https://github.com/backstage/backstage/

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