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CVE-2026-106486— Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions

Quick assessment

Affected
backstage backstage
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Backstage 是一个用于构建开发者门户的开放框架。在 @backstage/plugin-scaffolder-backend-module-bitbucket-cloud 0.3.10 之前版本，以及 @backstage/plugin-scaffolder-backend-module-bitbucket-server 0.2.25 之前版本中，Bitbucket 拉取请求的脚手架（Scaffolder）操作未对文件系统路径进行充分验证。经过身份验证的用户，若能执行符合条件的模板并影响一个允许的 Bitb

CVSS 8.5 · High
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I. Basic Information for CVE-2026-106486

Vulnerability Information
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Vulnerability Title
Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 0.3.10 in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud and 0.2.25 in @backstage/plugin-scaffolder-backend-module-bitbucket-server, the Bitbucket pull-request Scaffolder actions did not sufficiently validate filesystem paths. An authenticated user who can execute an eligible template and influence an allowed Bitbucket repository could affect paths outside the expected working area, potentially compromising backend confidentiality, integrity, or availability. This issue is fixed in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud 0.3.10 and @backstage/plugin-scaffolder-backend-module-bitbucket-server 0.2.25.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.54.6 -
@backstage plugin-scaffolder-backend-module-bitbucket-cloud < 0.3.10 -
@backstage plugin-scaffolder-backend-module-bitbucket-server < 0.2.25 -

II. Public POCs for CVE-2026-106486

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III. Intelligence Information for CVE-2026-106486

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Vendor Pages for CVE-2026-106486 (1)

Other References for CVE-2026-106486 (2)

Same Patch Batch · backstage · 2026-10-06 · 18 CVEs total

CVE-2026-106459 8.5 HIGH Backstage: Improper input validation in Sentry scaffolder actions
CVE-2026-106488 8.1 HIGH Backstage: Improper authentication in the OIDC provider
CVE-2026-106455 7.7 HIGH Backstage: Improper validation of MkDocs plugin configuration in TechDocs
CVE-2026-106492 7.6 HIGH Backstage: Improper preservation of access restrictions during service credential delegati
CVE-2026-106460 6.8 MEDIUM Backstage: Explicit negative email verification can be ignored during shared OAuth profile
CVE-2026-106457 6.8 MEDIUM Backstage: Insufficient audience validation in the Cloudflare Access auth provider
CVE-2026-106458 6.5 MEDIUM Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates
CVE-2026-106490 6.5 MEDIUM Backstage: Improper input validation in TechDocs static content requests
CVE-2026-106489 6.5 MEDIUM Backstage: Improper authorization enforcement for TechDocs static content
CVE-2026-106462 6.4 MEDIUM Backstage: Scaffolder credential handling may allow unintended GitHub authentication fallb
CVE-2026-106491 6.4 MEDIUM Backstage: Improper input validation in proxy-backend
CVE-2026-106463 5.4 MEDIUM Backstage: Improper authorization in GitLab organizational user ingestion
CVE-2026-106456 4.8 MEDIUM Backstage: Inconsistent credential enforcement for overlapping proxy routes
CVE-2026-106494 4.4 MEDIUM Backstage: Improper input validation in cloud storage URL readers
CVE-2026-106461 4.3 MEDIUM Backstage: Incorrect authorization in scaffolder task listing
CVE-2026-106487 3.5 LOW Backstage: Unsupported catalog cluster authentication mode in kubernetes backend
CVE-2026-106493 3.0 LOW Backstage: Cloud storage catalog locations may cross configured storage boundaries

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-22

V. Comments for CVE-2026-106486

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