CVE-2026-106508 json
Backstage: Potential file exposure through local TechDocs publisher
published 2026-10-06 33 d ago modified 2026-10-09 30 d ago also GHSA-cm77-ch27-6w6v , EUVD-2026-94073
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
Summary
Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: 'local'), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4.
Patch / fix
- npm @backstage/plugin-techdocs-node 1.15.4
- linuxfoundation backstage_plugin-techdocs-node 1.15.4
- linuxfoundation backstage 1.54.6
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 31 d ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @backstage/plugin-techdocs-node | <1.15.4 |
1.15.4 |
Affected products
- backstage backstage
- @backstage plugin-techdocs-node
Classification
References
-
github.com
/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4
web, patch
-
github.com
/backstage/backstage/releases/tag/v1.54.6
web, patch, release-notes
-
github.com
/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v
web, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-106508
advisory
-
github.com
/backstage/backstage
package
Sources
- CVE List CVE-2026-106508
- GitHub Advisory GHSA-cm77-ch27-6w6v
- NVD CVE-2026-106508
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.