Medium severity · published Mar 7, 2026
CVE-2026-29184
@backstage/plugin-scaffolder-backend: Potential Session Token Exfiltration via Log Redaction Bypass
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BA
backstage · backstage
< 3.1.4 · source: vendor
BA
Backstage/plugin-scaffolder-backend · Linuxfoundation
before 3.1.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-29184
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-29184
Vendor Advisory
https://github.com/backstage/backstage/security/advisories/GHSA-8qp7-fhr9-fw53
More from backstage
9.9
CVE-2026-106486
Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
9.8
CVE-2026-29186
@backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution
9.6
CVE-2026-106501
Backstage: Sensitive information exposure in Scaffolder
8.8
CVE-2026-106558
Backstage: Improper validation of TechDocs MkDocs configuration
8.8
CVE-2026-106509
Backstage: Improper validation of MkDocs theme configuration in TechDocs