CVE-2026-86766
Snipe-IT 8.6.3 Race Condition via Consumable Checkout
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.
INFO
Published Date :
Sept. 9, 2026, 2:17 p.m.
Last Modified :
Sept. 16, 2026, 8:28 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Snipe-IT to version 8.7.0 or later.
- Verify consumable inventory levels.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-86766.
| URL | Resource |
|---|---|
| https://github.com/grokability/snipe-it/commit/f71806b1e0efbd3bc2b6be61994ad2a5d5d6c206 | Patch |
| https://github.com/grokability/snipe-it/security/advisories/GHSA-x4g2-87xc-m5jm | Exploit Vendor Advisory |
| https://www.vulncheck.com/advisories/snipe-it-8.6.3-race-condition-via-consumable-checkout | Third Party Advisory |
| https://github.com/grokability/snipe-it/security/advisories/GHSA-x4g2-87xc-m5jm | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-86766 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-86766
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-86766 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-86766 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 16, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:snipeitapp:snipe-it:*:*:*:*:*:*:*:* versions up to (excluding) 8.7.0 Added Reference Type VulnCheck: https://github.com/grokability/snipe-it/commit/f71806b1e0efbd3bc2b6be61994ad2a5d5d6c206 Types: Patch Added Reference Type VulnCheck: https://github.com/grokability/snipe-it/security/advisories/GHSA-x4g2-87xc-m5jm Types: Exploit, Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/snipe-it-8.6.3-race-condition-via-consumable-checkout Types: Third Party Advisory Added Reference Type CISA-ADP: https://github.com/grokability/snipe-it/security/advisories/GHSA-x4g2-87xc-m5jm Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 09, 2026
Action Type Old Value New Value Added Reference https://github.com/grokability/snipe-it/security/advisories/GHSA-x4g2-87xc-m5jm Added SSVC {'id': 'CVE-2026-86766', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-09T14:08:27.655436Z'} -
New CVE Received by [email protected]
Sep. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Added CWE CWE-362 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/86xxx/CVE-2026-86766.json">CVE-2026-86766</a> Added Reference https://github.com/grokability/snipe-it/commit/f71806b1e0efbd3bc2b6be61994ad2a5d5d6c206 Added Reference https://github.com/grokability/snipe-it/security/advisories/GHSA-x4g2-87xc-m5jm Added Reference https://www.vulncheck.com/advisories/snipe-it-8.6.3-race-condition-via-consumable-checkout