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Description

Gumroad before 2026.07.06.2 contains a broken access control vulnerability in the PurchasesController that allows authenticated sellers to manipulate purchase access for other sellers' products by sending PUT requests to the revoke_access and undo_revoke_access actions without seller ownership validation. Attackers can modify the is_access_revoked status on arbitrary purchases to unauthorized revoke or restore buyer access to products they do not own.

PUBLISHED Reserved 2026-07-07 | Published 2026-07-08 | Updated 2026-07-09 | Assigner VulnCheck




HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Problem types

Missing Authorization

Product status

Default status
unaffected

Any version before 2026.07.06.2
affected

Credits

George Chen finder

References

github.com/antiwork/gumroad/issues/5725 (Researcher Disclousure) technical-description

github.com/antiwork/gumroad/releases/tag/v2026.07.06.2 (Release Notes) release-notes

github.com/antiwork/gumroad/pull/5731 (Fix PR) issue-tracking

github.com/...ommit/e7fd0e610e73135ecf1aa07c197a36fa524832e1 (Fix Commit) patch

www.vulncheck.com/...object-reference-in-purchasescontroller third-party-advisory

cve.org (CVE-2026-59805)

nvd.nist.gov (CVE-2026-59805)

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