What is CVE-2026-59709?

CVE-2026-59709 is a medium-severity vulnerability in Ghostfolio, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-07-07.

How severe is CVE-2026-59709?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Ghostfolio

CVE-2026-59709

Ghostfolio's PUT /api/v1/portfolio/holding/:dataSource/:symbol/tags endpoint fails to verify Access.permissions field when processing the Impersonation-Id header, allowing read-only access grantees to modify portfolio holding tags. Attackers with valid read-only share tokens can assign or remove tags on victim holdings, corrupting portfolio categorization and reports.

Vulnerability class: Broken Access Control

EPSS: 0.002 (10.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Ghostfolio — versions 0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

GitHub Issue (issue-tracking)
Product (product)
Patch Commit (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-59709?: CVE-2026-59709 is a medium-severity vulnerability in Ghostfolio, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-07-07.
How severe is CVE-2026-59709?: Medium severity. CVSS v3 base score is 4.3 out of 10.