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CVE-2026-106491

🗓️ 06 Oct 2026 20:45:08Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 27 Views🌐 WEB

Authenticated Backstage user can bypass base path via proxy-backend input validation flaw.

Related
Detection
Affected
Refs
Paths
ReporterTitlePublishedViews
Family
cvelist
Cvelist
CVE-2026-106491 Backstage: Improper input validation in proxy-backend
6 Oct 202620:45
–cvelist
euvd
EUVD
EUVD-2026-94010
7 Oct 202617:59
–euvd
github
Github Security Blog
Backstage: Improper input validation in proxy-backend
7 Oct 202617:59
–github
mend
Mend
CVE-2026-106491
6 Oct 202620:45
–mend
nvd
NVD
CVE-2026-106491
6 Oct 202621:17
–nvd
osv_ghsa
osv_ghsa
GHSA-9GHW-48H5-V2W5 Backstage: Improper input validation in proxy-backend
7 Oct 202617:59
–osv_ghsa
ptsecurity
Positive Technologies
PT-2026-107272
6 Oct 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)
CVE-2026-106491: Improper Input Validation
6 Oct 202600:00
–rapid7
redhatcve
RedhatCVE
CVE-2026-106491
9 Oct 202608:40
–redhatcve
snyk
Snyk
Directory Traversal
7 Oct 202617:59
–snyk
Rows per page
NVD
Vulners
[
  {
    "vendor": "backstage",
    "product": "backstage",
    "versions": [
      {
        "version": "< 1.54.6",
        "status": "affected"
      }
    ]
  },
  {
    "vendor": "@backstage",
    "product": "plugin-proxy-backend",
    "versions": [
      {
        "version": "< 0.6.17",
        "status": "affected"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
urlpath/proxy-backendImproper input validation in the proxy-backend allows an authenticated user to craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server.CWE-20, CWE-22

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22 Oct 2026 14:10Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.16.4
EPSS0.00275
SSVC
27