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CVE-2026-106499— Backstage: Secret-derived values may be exposed in scaffolder task logs

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 是用于构建开发者门户的一个开放框架。在 4.1.0 版本之前，@backstage/plugin-scaffolder-backend 包可能会将基于密钥派生的敏感值暴露到 Scaffolder 任务日志中。对于配置了敏感环境变量 scaffolder.defaultEnvironment.secrets 且允许攻击者创建或修改 Scaffolder 模板的部署实例，均会受到此漏洞影响。模板编写者可通过构造恶意模板，使在模板迭代过程中使用的、由密钥派生的敏感值被持久化并暴露给能够访问对应任务日志

CVSS 4.9 · Medium
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I. Basic Information for CVE-2026-106499

Vulnerability Information
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Vulnerability Title
Backstage: Secret-derived values may be exposed in scaffolder task logs
Source: CVE Program / CVE List V5
Vulnerability Description
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 attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.54.6 -
@backstage plugin-scaffolder-backend < 4.1.0 -

II. Public POCs for CVE-2026-106499

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III. Intelligence Information for CVE-2026-106499

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Vendor Pages for CVE-2026-106499 (1)

Other References for CVE-2026-106499 (2)

Same Patch Batch · backstage · 2026-10-06 · 32 CVEs total

CVE-2026-106501 9.6 CRITICAL Backstage: Sensitive information exposure in Scaffolder
CVE-2026-106459 8.5 HIGH Backstage: Improper input validation in Sentry scaffolder actions
CVE-2026-106500 8.5 HIGH Backstage: Improper task state validation in Scaffolder backend
CVE-2026-106486 8.5 HIGH Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
CVE-2026-106503 8.1 HIGH Backstage: Scaffolder action input authorization bypass
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-2026-106498 7.7 HIGH Backstage: Improper URL validation in catalog entity placeholder resolution
CVE-2026-106509 7.7 HIGH Backstage: Improper validation of MkDocs theme configuration in TechDocs
CVE-2026-106505 7.7 HIGH Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend
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-2026-106490 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-2026-106504 6.5 MEDIUM Backstage: Sensitive information exposure in scaffolder task logs
CVE-2026-106458 6.5 MEDIUM Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates
CVE-2026-106491 6.4 MEDIUM Backstage: Improper input validation in proxy-backend
CVE-2026-106462 6.4 MEDIUM Backstage: Scaffolder credential handling may allow unintended GitHub authentication fallb
CVE-2026-106463 5.4 MEDIUM Backstage: Improper authorization in GitLab organizational user ingestion

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-532

V. Comments for CVE-2026-106499

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