What is CVE-2026-29053?

CVE-2026-29053 is a high-severity vulnerability in Ghost, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.6/10. Published 2026-03-05.

How severe is CVE-2026-29053?

High severity. CVSS v3 base score is 7.6 out of 10.

Is CVE-2026-29053 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Ghost

CVE-2026-29053

Ghost is a Node.js content management system. From version 0.7.2 to 6.19.0, specifically crafted malicious themes can execute arbitrary code on the server running Ghost. This issue has been patched in version 6.19.1.

EPSS: 0.004 (29.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H.

Affected products

Ghost
Tryghost Ghost — versions >= 0.7.2, < 6.19.1

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-29053?: CVE-2026-29053 is a high-severity vulnerability in Ghost, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.6/10. Published 2026-03-05.
How severe is CVE-2026-29053?: High severity. CVSS v3 base score is 7.6 out of 10.
Is CVE-2026-29053 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.