CVE-2026-59709

Medium

Description

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductGhostfolio

PublishedJul 7, 2026

First seenJul 7, 2026

Weakness typeCWE-862Missing authorization

How to fix

Patches

github.com/ghostfolio/ghostfolio/commit/697ef59e3b58bebc5c21a9e482e4f5643390f316

Affected products

Product	Affected versions	Fixed in
Ghostfolio Ghostfolio	v ≤ 3.6.0	—

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