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CVE-2023-35926

28
FAUCET Score

CVE-2023-35926 is a critical remote code execution vulnerability affecting the Backstage scaffolder-backend plugin, specifically versions prior to 1.15.0. A malicious actor with write access to a registered scaffolder template can inject code into the template's YAML definition, leading to arbitrary code execution on the backend instance. This vulnerability carries a CVSS score of 9.9 (Critical) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.15.0CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.0HIGH

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.89%
Probability of exploitation in next 30 days
EPSS Percentile
77.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0189 is in the 82nd percentile among its peer group of 1,124 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 1.0 Bluesky, 0.5 Mastodon, and 1.6 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @backstage/plugin-scaffolder-backendFixed in: 1.15.0

Vendor Advisories (1)

npmGHSA-wg6p-jmpc-xjmrhigh

Backstage Scaffolder plugin has insecure sandbox

Jun 21, 2023

References

github.com / backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a
Patch
github.com / backstage/backstage/releases/tag/v1.15.0
Release Notes
github.com / backstage/backstage/security/advisories/GHSA-wg6p-jmpc-xjmr
Vendor Advisory