CVE-2026-106508

mediumpriority · track · 26EPSS 0.004 · 32 %ileUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.39% (32nd) EPSS

CVSS 6.5 · medium

Is it mine?

3 products

Check your exposure

Who says so?

2 sources

nvd · osv

EPSS · scored 2026-10-23

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.15.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · security-advisories@github.comexploitability 1.6 · impact 3.6

v3.15.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USCWE-22USCWE-59USCWE-59US

affected products (3)

Products and version ranges known to be affected.

linuxfoundation backstage< 1.54.6nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage plugin-techdocs-node< 1.15.4nvdUScpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*
npm @backstage/plugin-techdocs-node< 1.15.4osvUSpkg:npm/%40backstage/plugin-techdocs-node

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-cm77-ch27-6w6vBackstage has potential file exposure through local TechDocs publisher2026-10-07ghsa · osvUS
### Impact 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. ### Patches Patched in `@backstage/plugin-techdocs-node` version `1.15.4` ### Workarounds If you cannot upgrade immediately, consider switching to an external store for published TechDocs content (e.g. `awsS3`, `googleGcs`, or `azureBlobStorage` publishers)

sources

Which sources assert this record, and when.

nvd osv NVD CVE.org MITRE

published 2026-10-06modified 2026-10-09

references (3) nvd

External citations — patches, advisories, analysis.

https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4Patch
https://github.com/backstage/backstage/releases/tag/v1.54.6PatchRelease Notes
https://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6vMitigationVendor Advisory

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