CVE-2026-106500
HIGHDescription
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 24% of all known CVEs.
References
Related Vulnerabilities
Other CWE-59 (Link Following) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-30333 | High | 7.5 | 99% | KEV + Ransom | Fix |
| CVE-2021-21300 | High | 8.0 | 89% | - | Fix |
| CVE-2021-32610 | High | 7.1 | 73% | - | Fix |
| CVE-2020-36193 | High | 7.5 | 71% | KEV | Fix |
| CVE-2023-40028 | Medium | 4.9 | 69% | - | Fix |
| CVE-2024-57728 | High | 7.2 | 65% | KEV + Ransom | Fix |
Common questions
How do I fix CVE-2026-106500?
Upgrade @backstage/plugin-scaffolder-backend to 4.1.0 or later.
Is CVE-2026-106500 being actively exploited?
Not that we know of. CVE-2026-106500 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.33% is the estimated probability that it will be exploited in the next 30 days. That is higher than 24% of all scored CVEs.
How severe is CVE-2026-106500?
CVE-2026-106500 has a CVSS v3 base score of 8.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-106500 affect?
Published advisories record a fix for @backstage/plugin-scaffolder-backend (npm). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-106500
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-07.