CVE-2026-55643: Snipe-IT Tenant Isolation Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-c6w2-j4wq-mvwg
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CWE-863
Published
Advisory Summary

CVE-2026-55643 is a HIGH tenant isolation bypass vulnerability (CWE-863: Incorrect Authorization) affecting Snipe-IT libraries in the Packagist ecosystem. The issue involves tenant isolation bypass in fmcs floater mode. Remediation is available by upgrading affected packages to version 8.6.3.

CVE-2026-55643 at a Glance

CVE Identifier CVE-2026-55643
GHSA Identifier GHSA-c6w2-j4wq-mvwg
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-863: Incorrect Authorization
Affected Product Snipe-IT
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-55643

To remediate this vulnerability, upgrade all affected Snipe-IT dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

snipe/snipe-it fixed: 8.6.3 
Upgrade snipe/snipe-it to 8.6.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for snipe/snipe-it

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-55643, inspect your project dependencies for Snipe-IT:

inspect dependencies for snipe/snipe-it

Analyze the terminal output to locate any version of Snipe-IT in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.6.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Snipe-IT, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact Due to inconsistent authorization checks, a company-scoped user can bypass tenant boundaries to read, mutate, and soft-delete users who do not belong to any company (company_id = null). While direct instance authorization (isCurrentUserHasAccess) correctly denies access to these out-of-scope users, multiple API endpoints and bulk action web routes fail to enforce this restriction, relying instead on class-level permissions or broad scoped queries. Impact: A malicious user scoped to a specific company (e.g., Company A) can: Data Leakage: Extract PII and assigned licenses of users outside their tenant via the API (/api/v1/users and `/api/v1/users/{id}/licenses)`. Data Modification: Mutate out-of-scope user profiles (e.g., changing city, notes) via the /users/bulkeditsave web route. Data Deletion & Asset Theft: Soft-delete out-of-scope users and transfer their assigned assets to themselves via the /users/merge web route. ### Patches Patched in https://github.com/grokability/snipe-it/commit/fbe05a8df4742729a9b0756c016d45f48246cc7b,

CVE-2026-55643 Affected Snipe-IT Versions

1 component(s)
Fixed Versions:
8.6.3
Product / Package Ecosystem Affected Versions Fixed Version
snipe/snipe-it
 Packagist
< 8.6.3
8.6.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/grokability/snipe-it/security/advisories/GHSA-c6w2-j4wq-mvwg
NVD — CVE-2026-55643 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55643
Security Fix Commit FIX COMMIT
https://github.com/grokability/snipe-it/commit/fbe05a8df4742729a9b0756c016d45f48246cc7b
Snipe-IT Source Repository REPOSITORY
https://github.com/grokability/snipe-it
Snipe-IT Release RELEASE
https://github.com/grokability/snipe-it/releases/tag/v8.6.3

Frequently Asked Questions

What is CVE-2026-55643?
CVE-2026-55643 is a security vulnerability in Snipe-IT involving Tenant Isolation Bypass in FMCS Floater Mode under CWE-863: Incorrect Authorization.
Which Snipe-IT versions are affected?
Affected versions include releases prior to 8.6.3 across affected packages: snipe/snipe-it.
What version fixes CVE-2026-55643?
Upgrading to 8.6.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is snipe/snipe-it affected?
Yes, snipe/snipe-it is affected in releases prior to 8.6.3. Upgrade your dependency to 8.6.3 or later.
What CWE is associated with CVE-2026-55643?
CVE-2026-55643 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check Packagist dependencies for CVE-2026-55643?
Run the dependency tree command: 'inspect dependencies for snipe/snipe-it'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-c6w2-j4wq-mvwg",
  "modified" : "2026-09-02T15:27:32Z",
  "published" : "2026-08-19T19:32:11Z",
  "aliases" : [ "CVE-2026-55643" ],
  "summary" : "Snipe-IT: Tenant Isolation Bypass in FMCS Floater Mode",
  "details" : "### Impact\nDue to inconsistent authorization checks, a company-scoped user can bypass tenant boundaries to read, mutate, and soft-delete users who do not belong to any company (company_id = null). While direct instance authorization (isCurrentUserHasAccess) correctly denies access to these out-of-scope users, multiple API endpoints and bulk action web routes fail to enforce this restriction, relying instead on class-level permissions or broad scoped queries.\nImpact: \n\nA malicious user scoped to a specific company (e.g., Company A) can:\n\nData Leakage: Extract PII and assigned licenses of users outside their tenant via the API (/api/v1/users and `/api/v1/users/{id}/licenses)`.\n\nData Modification: Mutate out-of-scope user profiles (e.g., changing city, notes) via the /users/bulkeditsave web route.\n\nData Deletion & Asset Theft: Soft-delete out-of-scope users and transfer their assigned assets to themselves via the /users/merge web route.\n\n\n### Patches\nPatched in https://github.com/grokability/snipe-it/commit/fbe05a8df4742729a9b0756c016d45f48246cc7b,",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "snipe/snipe-it"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.6.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/grokability/snipe-it/security/advisories/GHSA-c6w2-j4wq-mvwg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55643"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grokability/snipe-it/commit/fbe05a8df4742729a9b0756c016d45f48246cc7b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/grokability/snipe-it"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grokability/snipe-it/releases/tag/v8.6.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-19T19:32:11Z",
    "nvd_published_at" : "2026-08-19T19:17:20Z"
  }
}