CVE-2026-106498
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. High risk of data exposure.
- Exploit odds
- 0.3% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.3% in the next 30 days (EPSS).
- Severity: 7.7 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.3% · EPSS, next 30 days
- Weakness
- CWE-863 · Incorrect authorization
- Record status
- Analyzed
Affected
- Linuxfoundation Backstage plugin-catalog-backend < 3.5.1
- Linuxfoundation Backstage plugin-catalog-backend < 3.6.2
- Linuxfoundation Backstage plugin-catalog-backend < 3.7.2
- Linuxfoundation Backstage plugin-catalog-backend < 3.8.2
- Linuxfoundation Backstage plugin-catalog-backend < 3.9.1
- Linuxfoundation Backstage < 1.49.6
- Linuxfoundation Backstage < 1.50.5
- Linuxfoundation Backstage < 1.51.3
Attack profile CVSS 3.1 · 7.7
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-106498.md and follow it. Check whether this project is affected by CVE-2026-106498. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e
- https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1
- https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634
- https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197
- https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6
- https://github.com/backstage/backstage/releases/tag/v1.49.6
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.51.3
- https://github.com/backstage/backstage/releases/tag/v1.53.2
- https://github.com/backstage/backstage/releases/tag/v1.54.6
References
- https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e
- https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1
- https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634
- https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197
- https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6
- https://github.com/backstage/backstage/releases/tag/v1.49.6
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.51.3
- https://github.com/backstage/backstage/releases/tag/v1.53.2
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73