EUVD-2026-42374
GHSA-4w48-6p23-843q
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable action needing only a low-privilege seller account (PR:L, AC:L, UI:N); impact is tampering with other sellers' purchase-access state, so I:H with C:N and A:N.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Broken access control in Gumroad's PurchasesController (versions before 2026.07.06.2) lets any authenticated seller revoke or restore buyer access to products they do not own by sending PUT requests to the revoke_access and undo_revoke_access actions, which fail to validate seller ownership. Because the actions operate on arbitrary purchase records via direct object reference, a low-privileged seller can tamper with the is_access_revoked flag on other sellers' sales. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid authenticated seller account on the target Gumroad instance (CVSS PR:L) - exploitation is not possible unauthenticated. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N, VI:H, all other impacts N) scores 7.1 and paints a coherent picture: network-reachable, low-complexity, requires a valid low-privilege seller account, no user interaction, and impact limited to integrity of purchase-access state. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers or uses an existing low-privilege seller account on a vulnerable Gumroad instance, then sends PUT requests to the revoke_access action referencing purchase IDs belonging to a competitor's products. With the ownership check missing (AV:N/AC:L/PR:L), the requests succeed and the victim's paying customers are locked out of the content they purchased; the attacker can also undo_revoke_access to restore access and mask tampering. … |
| Remediation | Vendor-released patch: 2026.07.06.2 - upgrade to Gumroad release v2026.07.06.2 (https://github.com/antiwork/gumroad/releases/tag/v2026.07.06.2), which adds the missing seller-ownership validation via PR #5731 and commit e7fd0e6. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Gumroad instances running versions prior to 2026.07.06.2. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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