CVE-2026-106491
Last modified
CVE-2026-106491 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
Description
Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server. This is limited to target servers already configured as proxy endpoints and requires Backstage authentication by default. This issue is fixed in version 0.6.17.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| backstage | backstage | < 1.54.6 |
| @backstage | plugin-proxy-backend | < 0.6.17 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-106491?
How severe is CVE-2026-106491?
How do I fix CVE-2026-106491?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-106486Backstage is an open framework for building developer portal…8.5
- CVE-2026-106487Backstage is an open framework for building developer portal…3.5
- CVE-2026-106488Backstage is an open framework for building developer portal…8.1
- CVE-2026-106489Backstage is an open framework for building developer portal…6.5
- CVE-2026-10649A flaw was found in Pacemaker. An unauthenticated remote att…8.6
- CVE-2026-106490Backstage is an open framework for building developer portal…6.5
- CVE-2026-106492Backstage is an open framework for building developer portal…7.6
- CVE-2026-106493Backstage is an open framework for building developer portal…3
- CVE-2026-106494Backstage is an open framework for building developer portal…4.4
- CVE-2026-106496Backstage is an open framework for building developer portal…3.1
- CVE-2026-106497Backstage is an open framework for building developer portal…4.3
- CVE-2026-106498Backstage is an open framework for building developer portal…7.7
Are you affected by CVE-2026-106491?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST