How severe is CVE-2026-55643?

No CVSS score has been assigned to CVE-2026-55643 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-55643?

CVE-2026-55643 affects the following packages: snipe/snipe-it (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2026-55643?

Update snipe/snipe-it to 8.6.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-55643 is resolved across your whole dependency graph.

How do I detect CVE-2026-55643 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for snipe/snipe-it, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-55643 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is CVE-2026-55643 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-55643 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-55643?

CVE-2026-55643 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 20th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-55643?

CVE-2026-55643 is classified as CWE-863 (CWE-863). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-55643 published, and has it been updated?

CVE-2026-55643 was published on August 19, 2026 and was last updated on October 2, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

CVE-2026-55643 — snipe/snipe-it

Fix: grokability/snipe-it@fbe05a8

CVE-2026-55643 is a CWE-863 vulnerability in snipe/snipe-it. A fix is available for snipe/snipe-it — see the affected versions and patch details below.

Snipe-IT: Tenant Isolation Bypass in FMCS Floater Mode

Also known asGHSA-c6w2-j4wq-mvwg

Published

Aug 19, 2026

Updated

Oct 2, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-55643.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk-0.25%

Lower risk than most CVEs20th percentile — riskier than 20% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐘snipe/snipe-it

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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,

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`snipe/snipe-it`	all versions	8.6.3`composer require snipe/snipe-it:^8.6.3`

Affected Products

1 product · 1 configurations

Application

snipe-itsnipeitapp

< 8.6.3

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for snipe/snipe-it, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update snipe/snipe-it to 8.6.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-55643 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

### 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

O3 Security · Impact-Aware SCA

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