{"id":"CVE-2026-59709","title":"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","summary":"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. Attac…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-862"],"vendor":"Ghostfolio","product":"Ghostfolio","affected":["Ghostfolio <= 3.6.0"],"published":"2026-07-07","updated":"2026-09-17","sourceUpdated":"2026-09-17T18:16:55.150","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59709","references":[{"url":"https://github.com/ghostfolio/ghostfolio","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ghostfolio/ghostfolio/commit/697ef59e3b58bebc5c21a9e482e4f5643390f316","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ghostfolio/ghostfolio/issues/7196","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/ghostfolio-unauthorized-portfolio-holding-tag-modification-via-missing-permission-check","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ghostfolio/ghostfolio/issues/7196","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-08T16:49:02.251483Z"},"epss":0.00243,"epssPercentile":0.15757,"ingestedAt":"2026-09-17T18:25:15.974Z","slug":"CVE-2026-59709","body":"## Overview\n\nGhostfolio'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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":36,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}