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CVE-2026-106458— Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates

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源框架。从版本 0.4.0 到 0.5.15， 包存在 Bitbucket Server 目录事件更新中仓库过滤不一致的安全漏洞。使用 Bitbucket Server 目录提供程序的事件驱动更新机制进行部署的系统，可能会错误地将不符合配置的过滤规则（如项目、仓库或已归档仓库）的仓库的目录位置（catalog locations）导入到目录中。 具体来说，如果存在一个经过过滤排除但仍可通过配置的 Backstage 集保持可读性的 Bitbucket Server 仓

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-106458

Vulnerability Information
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Vulnerability Title
Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. From 0.4.0 until 0.5.15, the @backstage/plugin-catalog-backend-module-bitbucket-server package is affected by inconsistent repository filtering in bitbucket server catalog event updates. Deployments using event-driven updates in the Bitbucket Server catalog provider may ingest catalog locations from repositories that are excluded by the provider's configured project, repository, or archived-repository filters. An authenticated Bitbucket Server user who can push to a filtered-out repository that remains readable by the configured Backstage integration can trigger a legitimate repository event. The affected event path may then add a Location for that repository even though scheduled discovery excludes it. This issue is fixed in version 0.5.15.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage >= 1.38.0, < 1.55.0 -
@backstage plugin-catalog-backend-module-bitbucket-server >= 0.4.0, < 0.5.15 -

II. Public POCs for CVE-2026-106458

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III. Intelligence Information for CVE-2026-106458

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Vendor Advisories for CVE-2026-106458 (1)

Vendor Pages for CVE-2026-106458 (1)

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-2026-106486 8.5 HIGH Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
CVE-2026-106500 8.5 HIGH Backstage: Improper task state validation in Scaffolder backend
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-2026-106505 7.7 HIGH Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend
CVE-2026-106509 7.7 HIGH Backstage: Improper validation of MkDocs theme configuration in TechDocs
CVE-2026-106498 7.7 HIGH Backstage: Improper URL validation in catalog entity placeholder resolution
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-2026-106489 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-2026-106490 6.5 MEDIUM Backstage: Improper input validation in TechDocs static content requests
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
CVE-2026-106502 5.3 MEDIUM Backstage: Sensitive information may be exposed in Scaffolder task failure events

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

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-863

V. Comments for CVE-2026-106458

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