CVE-2026-86766 Snipe-IT 8.6.3 Race Condition via Consumable Checkout

High 7.1 Published 9 Sep 2026 Updated 9 Sep 2026

Authenticated users can exploit a race condition in Snipe-IT to over-allocate consumable inventory, causing negative stock counts.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-86766?

CVE-2026-86766 is a high-severity vulnerability in Snipeitapp Snipe-It, published on 9 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-362

Which versions are affected by CVE-2026-86766?

It affects 1 product.

Products include Snipeitapp Snipe-It.

How do I fix CVE-2026-86766?

No fix has been published for CVE-2026-86766 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-86766 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86766 exists.

All Snipeitapp Snipe-It vulnerabilities

Sources

Also known as GHSA-463q-rqpx-h2jj, GHSA-x4g2-87xc-m5jm.