CVE.org (no NVD analysis yet)· CNA GitHub_M

CVE-2026-106556: Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization

HighCVSS 7.7 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.25% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
No fixed version is recorded, but the references include a patch (commit or PR) link.

Low priority for now. See the fix and affected versions sections below.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.

EUVD-2026-94370

Published: Oct 7, 2026
Updated: Oct 13, 2026
EPSS: 0.2% · 17th percentile
CWE: CWE-78

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 7.7; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linuxfoundation	backstage	cpe:2.3:a:linuxfoundation:backstage
linuxfoundation	backstage plugin-techdocs-node	cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

@backstage plugin-techdocs-node
- < 1.14.6, >= 1.15.0, < 1.15.4affected
backstage backstage
- < 1.50.5, >= 1.51.0-next.0, < 1.54.6affected

Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linuxfoundation backstagebefore 1.50.5
linuxfoundation backstage1.51.1 and later · before 1.54.6
linuxfoundation backstage1.51.0
linuxfoundation backstage plugin-techdocs-nodebefore 1.14.6
linuxfoundation backstage plugin-techdocs-node1.15.0 and later · before 1.15.4

Same product

linuxfoundation: all records

Other highest-scoring records for the same primary product.

CVE-2023-35926Insecure sandbox in Backstage Scaffolder plugin
40Plan
CVE-2026-25153@backstage/plugin-techdocs-node vulnerable to arbitrary code execution via MkDocs hooks
35Monitor
CVE-2021-43783Path Traversal in @backstage/plugin-scaffolder-backend
34Monitor

Published before and after this one in the same product

← EarlierCVE-2026-32235Mar 12, 2026 · @backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass
18Monitor
← EarlierCVE-2026-32236Mar 12, 2026 · @backstage/plugin-auth-backend: SSRF in experimental CIMD metadata fetch
6Monitor
← EarlierCVE-2026-106493Oct 6, 2026 · Backstage: Cloud storage catalog locations may cross configured storage boundaries
16Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: high · data can be read
Integrity: low · data or configuration can be modified
Availability: low · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Network
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Changed
Confidentiality impact: High
Integrity impact: Low
Availability impact: Low

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

nvd-secondary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const host = req.body.host;
2exec("ping -c 1 " + host, onResult);

Fixed

1const host = req.body.host;
2if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);
3execFile("ping", ["-c", "1", host], onResult);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (2)

SSVC exploitation— → noneOct 7, 2026, 6:07 PM UTC
Exploit maturity— → noneOct 7, 2026, 4:07 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records