Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.
CVE-2026-106498
HIGHPre-NVD 7.77.7
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.7Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 7.7
- EG Score
- 7.7HIGHlow confidence
- EG Risk
- 39EG Risk 39/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity77% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 6, 2026
Last Modified
October 7, 2026
Advisory Details (10)
Auto-updated Oct 6, 2026Patch available. Sources: github_commit, github_release, github.
github_release Patch Available
v1.53.2
Patch available: backstage/backstage v1.53.2
https://github.com/backstage/backstage/releases/tag/v1.53.2github_release Patch Available
v1.51.3
Patch available: backstage/backstage v1.51.3
https://github.com/backstage/backstage/releases/tag/v1.51.3github_release Patch Available
v1.50.5
Patch available: backstage/backstage v1.50.5
https://github.com/backstage/backstage/releases/tag/v1.50.5github_release Patch Available
v1.49.6
Patch available: backstage/backstage v1.49.6
https://github.com/backstage/backstage/releases/tag/v1.49.6github_commit Patch Available
commit e786ac309ed2 (backstage/backstage)
Patch available: backstage/backstage v1.50.5 (contains commit e786ac309ed2)
https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6github_commit Patch Available
commit 99729e925fd2 (backstage/backstage)
Patch available: backstage/backstage v1.49.6 (contains commit 99729e925fd2)
https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197github_commit Patch Available
commit 61a10f19926a (backstage/backstage)
Patch available: backstage/backstage v1.54.6 (contains commit 61a10f19926a)
https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634github_commit Patch Available
commit 286bfc1f9cc3 (backstage/backstage)
Patch available: backstage/backstage v1.53.2 (contains commit 286bfc1f9cc3)
https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1github_commit Patch Available
commit 0b0f6fc89b4e (backstage/backstage)
Patch available: backstage/backstage v1.51.3 (contains commit 0b0f6fc89b4e)
https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6egithubMentions a patch (unverified)
Improper URL validation in catalog entity placeholder resolution · Advisory · backstage/backstage · GitHub
https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73Vendor Advisories for CVE-2026-106498(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| @backstage/plugin-catalog-backend | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-06 22:32 UTCEG score recompute
- 2026-10-06 21:37 UTCEG score recompute
- 2026-10-06 21:36 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(4)
What is CVE-2026-106498?
CVE-2026-106498 is a high vulnerability published on October 6, 2026. Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity…
When was CVE-2026-106498 disclosed?
CVE-2026-106498 was first published on October 6, 2026, with the most recent update on October 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-106498?
CVE-2026-106498 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-106498?
A fix for CVE-2026-106498 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-106498 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-106498
Is Your Infrastructure Affected by CVE-2026-106498?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.