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CVE-2026-29184— @backstage/plugin-scaffolder-backend: Potential Session Token Exfiltration via Log Redaction Bypass

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Backstage开源的一个应用软件。后台是一个开放的平台,用于构建开发者门户。 Backstage 3.1.4之前版本存在日志信息泄露漏洞，该漏洞源于恶意脚手架模板可绕过日志编辑机制，可能导致通过任务事件日志泄露秘密。

CVSS 2.0 · Low EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-29184

Vulnerability Information
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Vulnerability Title
@backstage/plugin-scaffolder-backend: Potential Session Token Exfiltration via Log Redaction Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to version 3.1.4, a malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs. This issue has been patched in version 3.1.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/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
Vulnerability Title
Backstage 日志信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Backstage是Backstage开源的一个应用软件。后台是一个开放的平台,用于构建开发者门户。 Backstage 3.1.4之前版本存在日志信息泄露漏洞，该漏洞源于恶意脚手架模板可绕过日志编辑机制，可能导致通过任务事件日志泄露秘密。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 3.1.4 -

II. Public POCs for CVE-2026-29184

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III. Intelligence Information for CVE-2026-29184

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Vendor Advisories for CVE-2026-29184 (1)

Same Patch Batch · backstage · 2026-03-07 · 3 CVEs total

CVE-2026-29186 7.7 HIGH @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code
CVE-2026-29185 2.7 LOW @backstage/integration: Potential reading of SCM URLs using built in token

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-29184

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