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Vulnerability details: VCID-k15p-db8h-sqbz
Vulnerability ID VCID-k15p-db8h-sqbz
Aliases CVE-2026-32236
GHSA-qp4c-xg64-7c6x
Summary Backstage is an open framework for building developer portals. Prior to 0.27.1, a Server-Side Request Forgery (SSRF) vulnerability exists in @backstage/plugin-auth-backend when auth.experimentalClientIdMetadataDocuments.enabled is set to true. The CIMD metadata fetch validates the initial client_id hostname against private IP ranges but does not apply the same validation after HTTP redirects. The practical impact is limited. The attacker cannot read the response body from the internal request, cannot control request headers or method, and the feature must be explicitly enabled via an experimental flag that is off by default. Deployments that restrict allowedClientIdPatterns to specific trusted domains are not affected. Patched in @backstage/plugin-auth-backend version 0.27.1.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-918 Server-Side Request Forgery (SSRF)
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00047 https://api.first.org/data/v1/epss?cve=CVE-2026-32236
cvssv3.1_qr LOW https://github.com/advisories/GHSA-qp4c-xg64-7c6x
cvssv4 1.7 https://github.com/backstage/backstage
generic_textual LOW https://github.com/backstage/backstage
cvssv4 1.7 https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07
generic_textual LOW https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07
ssvc Track https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07
cvssv3.1_qr LOW https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
cvssv4 1.7 https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
generic_textual LOW https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
ssvc Track https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
cvssv4 1.7 https://nvd.nist.gov/vuln/detail/CVE-2026-32236
generic_textual LOW https://nvd.nist.gov/vuln/detail/CVE-2026-32236
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-32236.json
https://api.first.org/data/v1/epss?cve=CVE-2026-32236
https://github.com/backstage/backstage
https://nvd.nist.gov/vuln/detail/CVE-2026-32236
17038abf2dfdb4abc08a59b1c95af39851de0e07 https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07
2447090 https://bugzilla.redhat.com/show_bug.cgi?id=2447090
GHSA-qp4c-xg64-7c6x https://github.com/advisories/GHSA-qp4c-xg64-7c6x
GHSA-qp4c-xg64-7c6x https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U Found at https://github.com/backstage/backstage
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U Found at https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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adjacent

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-12T20:38:12Z/ Found at https://github.com/backstage/backstage/commit/17038abf2dfdb4abc08a59b1c95af39851de0e07
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U Found at https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-12T20:38:12Z/ Found at https://github.com/backstage/backstage/security/advisories/GHSA-qp4c-xg64-7c6x
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U Found at https://nvd.nist.gov/vuln/detail/CVE-2026-32236
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

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passive

active

high

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none

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Exploit Prediction Scoring System (EPSS)
Percentile 0.14894
EPSS Score 0.00047
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:49:16.742907+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/32xxx/CVE-2026-32236.json 38.6.0