CVE-2026-106559

mediumpriority · track · 26EPSS 0.003 · 26 %ileUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.33% (26th) EPSS

CVSS 6.5 · medium

Is it mine?

3 products

Check your exposure

Who says so?

2 sources

nvd · osv

EPSS · scored 2026-10-27

Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper input validation in confluence to markdown scaffolder module. Insufficient input validation in the Confluence to Markdown scaffolder module could allow an attacker to influence file write operations during template execution. Exploitation requires a Backstage user to run a template that processes attacker-influenced Confluence content. This issue is fixed in version 0.3.25.

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:N/UI:R/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:Lsecondary · security-advisories@github.comexploitability 2.1 · impact 4.2

v3.16.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:Lsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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-73USCWE-73US

affected products (3)

Products and version ranges known to be affected.

linuxfoundation backstage< 1.54.6nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage/plugin-scaffolder-backend-module-confluence-to-markdown< 0.3.25nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-confluence-to-markdown:*:*:*:*:*:*:*:*
npm @backstage/plugin-scaffolder-backend-module-confluence-to-markdown< 0.3.25osvUSpkg:npm/%40backstage/plugin-scaffolder-backend-module-confluence-to-markdown

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-75qf-886x-5xf2Backstage: Improper input validation in Confluence to Markdown scaffolder module2026-10-07ghsa · osvUS
### Impact Insufficient input validation in the Confluence to Markdown scaffolder module could allow an attacker to influence file write operations during template execution. Exploitation requires a Backstage user to run a template that processes attacker-influenced Confluence content. ### Patches Patched in `@backstage/plugin-scaffolder-backend-module-confluence-to-markdown` version `0.3.25` ### Workarounds If unable to update immediately: - Restrict Confluence edit access to trusted users. - Review Confluence page content before running scaffolder templates against untrusted pages.

sources

Which sources assert this record, and when.

nvd osv NVD CVE.org MITRE

published 2026-10-07modified 2026-10-16

references (3) nvd

External citations — patches, advisories, analysis.

https://github.com/backstage/backstage/commit/506c2c11bce3ed9d1f8f50de5d6474b16e43a65ePatch
https://github.com/backstage/backstage/releases/tag/v1.54.6PatchRelease Notes
https://github.com/backstage/backstage/security/advisories/GHSA-75qf-886x-5xf2MitigationVendor Advisory

scry

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