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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.

PUBLISHED Reserved 2026-07-06 | Published 2026-07-07 | Updated 2026-07-09 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Problem types

Missing Authorization

Product status

Default status
unaffected

Any version
affected

Credits

George Chen reporter

References

github.com/ghostfolio/ghostfolio/issues/7196 exploit

github.com/ghostfolio/ghostfolio/issues/7196 (GitHub Issue) issue-tracking

github.com/ghostfolio/ghostfolio (Product) product

github.com/...ommit/697ef59e3b58bebc5c21a9e482e4f5643390f316 (Patch Commit) patch

www.vulncheck.com/...dification-via-missing-permission-check third-party-advisory

cve.org (CVE-2026-59709)

nvd.nist.gov (CVE-2026-59709)

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