CVE-2026-32236Network attack vector

SSRF via unvalidated CIMD redirect targets

Published Mar 12, 2026 · Updated Mar 12, 2026

SSRF in Backstage @backstage/plugin-auth-backend before 0.27.1 allows remote attackers to send server-side GET requests via CIMD redirects. The CIMD metadata fetch checks the initial client_id host against private ranges but follows redirects without reapplying that check. Exposure requires an unauthenticated auth flow and an off-by-default experimental flag; responses remain unreadable, and trusted-domain allowlists block the path.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Backstage @backstage/plugin-auth-backend before 0.27.1 allows remote attackers to send server-side GET requests via CIMD redirects. The CIMD metadata fetch checks the initial client_id host against private ranges but follows redirects without reapplying that check. Exposure requires an unauthenticated auth flow and an off-by-default experimental flag; responses remain unreadable, and trusted-domain allowlists block the path.

The record

CVE
CVE-2026-32236
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
Backstage
Product
@backstage/plugin-auth-backend
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.27.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Backstage · @backstage/plugin-auth-backendversion=< 0.27.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
1.7GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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