Is CVE-2026-29186 in the CISA KEV catalog?

No. CVE-2026-29186 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-29186?

CVE-2026-29186 has a CVSS v3 base score of 7.7 (HIGH).

What is the EPSS score for CVE-2026-29186?

CVE-2026-29186 has an EPSS score of 0.48% (37th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2026-29186

HIGH

7.7

CVSS v3

NVD

Description

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.

CWE-74 CWE-434Unrestricted File Upload

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.48%probability of exploitation in 30 days

37thpercentile

Low risk: more likely to be exploited than 37% of all known CVEs.

References

https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-11.