Grokability Snipe-IT up to 8.6.3 Consumable Checkout checkout toctou

Summaryinfo

A vulnerability classified as problematic was found in Grokability Snipe-IT up to 8.6.3. Impacted is an unknown function of the file /api/v1/consumables/{consumable_id}/checkout of the component Consumable Checkout. Executing a manipulation can lead to toctou. This vulnerability appears as CVE-2026-86766. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Grokability Snipe-IT up to 8.6.3. It has been declared as problematic. This vulnerability affects an unknown function of the file /api/v1/consumables/{consumable_id}/checkout of the component Consumable Checkout. The manipulation with an unknown input leads to a toctou vulnerability. The CWE definition for the vulnerability is CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. As an impact it is known to affect integrity. CVE summarizes:

Snipe-IT versions up to and including 8.6.3 contain a race condition (TOCTOU) in the consumable checkout API endpoint (POST /api/v1/consumables/{consumable_id}/checkout). The requested quantity is validated against the number of remaining units before the database transaction begins, and the transaction then creates the checkout records without locking the consumable row or re-checking availability. An authenticated user with permission to check out consumables can submit concurrent checkout requests for the same consumable so that both requests pass the availability check and succeed, over-allocating stock and driving the remaining inventory negative (e.g., a consumable with 1 remaining unit ends at -1 after two concurrent 1-unit checkouts). The issue is fixed in 8.7.0, which re-fetches the parent row under lockForUpdate inside the transaction and re-validates availability.

The advisory is available at github.com. This vulnerability was named CVE-2026-86766 since 09/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit.

Upgrading to version 8.7.0 eliminates this vulnerability.

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Productinfo

Vendor

• Grokability

Name

• Snipe-IT

Version

• 8.6.0
• 8.6.1
• 8.6.2
• 8.6.3

Website

• Product: https://github.com/grokability/snipe-it/

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