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CVE-2026-106559— Backstage: Improper input validation in Confluence to Markdown scaffolder module

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 0.3.25 版本之前， 包存在缺陷：该包中的 Confluence 到 Markdown 模板生成模块对输入数据的验证处理不当。由于该模块缺乏充分的输入验证，攻击者可能在模板执行期间影响文件写入操作。成功利用此漏洞需要一名 Backstage 用户运行一个会处理攻击者构造的 Confluence 内容的模板。该问题已在 0.3.25 版本中修复。

CVSS 6.3 · Medium
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I. Basic Information for CVE-2026-106559

Vulnerability Information
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Vulnerability Title
Backstage: Improper input validation in Confluence to Markdown scaffolder module
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper input validation in confluence to markdown scaffolder module. Insufficient input validation in the Confluence to Markdown scaffolder module could allow an attacker to influence file write operations during template execution. Exploitation requires a Backstage user to run a template that processes attacker-influenced Confluence content. This issue is fixed in version 0.3.25.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L
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-confluence-to-markdown < 0.3.25 -

II. Public POCs for CVE-2026-106559

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III. Intelligence Information for CVE-2026-106559

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Vendor Pages for CVE-2026-106559 (1)

Other References for CVE-2026-106559 (2)

Same Patch Batch · backstage · 2026-10-07 · 8 CVEs total

CVE-2026-106558 8.8 HIGH Backstage: Improper validation of TechDocs MkDocs configuration
CVE-2026-106510 7.7 HIGH Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml
CVE-2026-106556 7.7 HIGH Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization
CVE-2026-106560 7.1 HIGH Backstage: Improper repository path validation in a Scaffolder backend module
CVE-2026-106563 5.3 MEDIUM Backstage: Improper entity validation in deprecated Kubernetes services endpoint
CVE-2026-106561 5.0 MEDIUM Backstage: Sensitive information disclosure in Kubernetes resource queries
CVE-2026-106562 4.3 MEDIUM Backstage: Incorrect authorization in search engine permission filtering

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-106559

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