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

Quick assessment

Affected
grokability snipe-it
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Snipe-IT 8.6.3 及更早版本中存在一个竞态条件（TOCTOU）漏洞，位于耗材签出 API 端点（POST /api/v1/consumables/{consumable_id}/checkout）中。在数据库事务开始之前，系统会验证请求的数量是否与剩余可用数量匹配；随后，事务在创建签出记录时，既没有对耗材行加锁，也没有重新检查可用性。因此，拥有耗材签出权限的已认证用户可以针对同一耗材提交并发的签出请求，使两个请求都能通过可用性检查并成功执行，导致库存被超额分配，最终使剩余库存变为负数（例如，一个仅剩 1

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-86766

Vulnerability Information
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Vulnerability Title
Snipe-IT 8.6.3 Race Condition via Consumable Checkout
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
grokability snipe-it 8.6.3 ~ 8.7.0 -

II. Public POCs for CVE-2026-86766

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III. Intelligence Information for CVE-2026-86766

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Other References for CVE-2026-86766 (2)

Same Patch Batch · grokability · 2026-09-09 · 36 CVEs total

CVE-2026-86741 8.5 HIGH Snipe-IT before 8.7.0 Arbitrary File Read and SSRF via Category EULA
CVE-2026-86751 8.5 HIGH Snipe-IT before 8.7.0 Arbitrary File Read and SSRF via Markdown
CVE-2026-86762 8.1 HIGH Snipe-IT before 8.7.0 Authentication Bypass via API Middleware
CVE-2026-86770 8.1 HIGH Snipe-IT before 8.7.0 Authentication Bypass via SAML Username Collation
CVE-2026-86750 7.7 HIGH snipe-it before 8.7.0 Authorization Bypass via API User Create/Update
CVE-2026-86771 7.6 HIGH Snipe-IT before 8.7.0 Server-Side Request Forgery via employee_num
CVE-2026-86754 7.3 HIGH Snipe-IT before 8.7.0 Authorization Bypass via OAuth Clients
CVE-2026-86759 7.1 HIGH Snipe-IT before 8.7.0 Missing Authorization via asset-history CSV importer
CVE-2026-86757 6.5 MEDIUM Snipe-IT before 8.7.0 Information Disclosure via Custom Fields
CVE-2026-86764 6.5 MEDIUM Snipe-IT 8.6.4 before 8.7.0 Permission Bypass via assigned components
CVE-2026-86758 6.5 MEDIUM Snipe-IT before 8.7.0 License Key Exposure via CSV Export
CVE-2026-86765 6.5 MEDIUM Snipe-IT 8.6.3 Authorization Bypass via Asset Update Endpoint
CVE-2026-86742 6.5 MEDIUM Snipe-IT before 8.7.0 CSV Formula Injection via Asset Acceptance Report
CVE-2026-86745 6.5 MEDIUM Snipe-IT before 8.7.0 CSV Formula Injection via Location-Scoping Export
CVE-2026-86746 6.4 MEDIUM Snipe-IT before 8.7.0 Authorization Bypass via Livewire Snapshot Replay
CVE-2026-86774 6.3 MEDIUM Snipe-IT before 8.7.0 Broken Access Control via AssetModelPolicy
CVE-2026-86749 6.3 MEDIUM snipe-it before 8.7.0 Data Loss via Failed Image Write
CVE-2026-86756 6.1 MEDIUM Snipe-IT 8.5.0 through 8.6.3 Open Redirect via SAML RelayState
CVE-2026-86748 6.1 MEDIUM Snipe-IT before 8.7.0 Database Wipe via Invalid Backup Archive
CVE-2026-86768 5.4 MEDIUM Snipe-IT before 8.7.0 Improper Input Validation via API Checkout

Showing top 20 of 36 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: snipe-it
Same vendor: grokability
Same weakness: CWE-362

V. Comments for CVE-2026-86766

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