CVE-2026-106455— Backstage: Improper validation of MkDocs plugin configuration in TechDocs
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。在版本 0.11.12 至 1.14.7 以及 1.15.5 之前，@backstage/plugin-techdocs-node 包存在对 TechDocs 中 MkDocs 插件配置验证不当的问题。拥有受认证权限且能够控制 TechDocs 源仓库的攻击者，可诱使文档构建过程从构建环境可达的网络位置检索并发布数据。具体暴露风险取决于部署拓扑结构、构建模式以及目标端点的安全防护措施。受此漏洞影响的行为无法直接访问需要令牌或特殊请求头的现代云元数据服务。该问题
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I. Basic Information for CVE-2026-106455
Vulnerability Information
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Vulnerability Title
Backstage: Improper validation of MkDocs plugin configuration in TechDocs
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. From 0.11.12 until 1.14.7 and 1.15.5, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs plugin configuration in techdocs. An authenticated attacker with control over a TechDocs source repository could cause a documentation build to retrieve and publish data from network locations reachable by the build environment. Exposure depends on deployment topology, build mode, and target endpoint protections. Modern cloud metadata services that require tokens or special headers are not directly accessible through the affected behavior. This issue is fixed in @backstage/plugin-techdocs-node versions 1.14.7 and 1.15.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| backstage | backstage | >= 0.71.1, < 1.50.6 | - |
|
| @backstage | plugin-techdocs-node | >= 0.11.12, < 1.14.7 | - |
|
II. Public POCs for CVE-2026-106455
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-106455 (6)
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https://github.com/backstage/backstage/releases/tag/v1.54.8 x_refsource_MISC
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https://github.com/backstage/backstage/releases/tag/v1.50.6 x_refsource_MISC
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https://github.com/backstage/backstage/releases/tag/v1.55.0 x_refsource_MISC
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https://github.com/backstage/backstage/security/advisories/GHSA-q38j-6vcm-2f5m x_refsource_CONFIRM
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-2026-106486 | 8.5 HIGH | Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions |
| CVE-2026-106488 | 8.1 HIGH | Backstage: Improper authentication in the OIDC provider |
| 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
-
CVE-2026-106494
Backstage: Improper input validation in cloud storage URL re -
CVE-2026-106493
Backstage: Cloud storage catalog locations may cross configu -
CVE-2026-106492
Backstage: Improper preservation of access restrictions duri -
CVE-2026-106491
Backstage: Improper input validation in proxy-backend -
CVE-2026-106490
Backstage: Improper input validation in TechDocs static cont
Same vendor: backstage
-
CVE-2026-106494
Backstage: Improper input validation in cloud storage URL re -
CVE-2026-106493
Backstage: Cloud storage catalog locations may cross configu -
CVE-2026-106492
Backstage: Improper preservation of access restrictions duri -
CVE-2026-106491
Backstage: Improper input validation in proxy-backend -
CVE-2026-106490
Backstage: Improper input validation in TechDocs static cont
Same weakness: CWE-918
V. Comments for CVE-2026-106455
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