CVE-2025-55285Network attack vector

Template secret disclosure via pre-redaction logging

Published Aug 15, 2025 · Updated Aug 15, 2025

Sensitive-data exposure in Backstage Scaffolder before 2.1.1 allows remote authenticated users to read template secrets from logs. BackstageLoggerTransport forwarded Winston SPLAT input values to the backend logger before emitting the redacted task message, creating a duplicate pre-redaction log path. Exposure requires a template author to pass secrets to fetch:template and an attacker to obtain Scaffolder or build-log access; integrity and availability are unaffected.

CVSS severity2.6
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-data exposure in Backstage Scaffolder before 2.1.1 allows remote authenticated users to read template secrets from logs. BackstageLoggerTransport forwarded Winston SPLAT input values to the backend logger before emitting the redacted task message, creating a duplicate pre-redaction log path. Exposure requires a template author to pass secrets to fetch:template and an attacker to obtain Scaffolder or build-log access; integrity and availability are unaffected.

The record

CVE
CVE-2025-55285
Published
Aug 15, 2025
Updated
Aug 15, 2025
Vendor
Backstage
Product
Backstage
Classifications
CWE-532, T1654
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2025Record 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=< 2.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Backstage · Backstageversion=< 2.1.1

Published CVSS scores

2.6GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-532Insertion of Sensitive Information into Log File
T1654Log Enumeration

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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