CVE-2026-59709: Ghostfolio

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Ghostfolio Ghostfolio

Published 2026-07-07. Last modified 2026-09-17.