Auth bypass in Ghostmanager Ghostwriter
CVE-2026-78203
Ghostwriter before 7.1.2 fails to validate template ownership in the report template swap endpoint, allowing attackers to attach client-scoped templates from other clients to their own reports. Attackers can exploit sequential template primary keys to enumerate and attach foreign templates, then generate reports to disclose template contents including letterhead, boilerplate, and methodology text.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (28.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/GhostManager/Ghostwriter/commit/5b2a4a297e44c823c16f65b1ba101c742791… (patch)
- github.com/GhostManager/Ghostwriter (product)
- github.com/GhostManager/Ghostwriter/blob/v7.1.1/ghostwriter/reporting/views.py (technical-description)
- github.com/geo-chen/oss/blob/main/Ghostwriter.md (third-party-advisory)
- www.vulncheck.com/advisories/ghostwriter-before-cross-client-report-template-di… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-78203?
- CVE-2026-78203 is a high-severity vulnerability in Ghostmanager Ghostwriter, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-08-24.
- How severe is CVE-2026-78203?
- High severity. CVSS v3 base score is 7.1 out of 10.