CVE-2026-2459
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability exists in REB500 for an authenticated user with Installer role to access and alter the contents of directories that the role is not authorized to do so.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is an authorization bypass vulnerability in REB500 where an authenticated user with Installer role can access and modify directories outside their intended permissions. The vulnerability allows vertical privilege escalation by bypassing role-based access control (RBAC) restrictions on directory access.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 8.3.3.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify REB500 firmware versionAccess the REB500 device management interface or check the firmware version via the device's system information or version command. This is typically found in the device console, web UI, or via SNMP/sysinfo query.Affected if The installed firmware version is 8.3.3.0 or lower.
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Locate user role assignmentsQuery the user management or access control configuration to identify accounts assigned the Installer role. Check the RBAC settings or user database for role definitions.Affected if Any user account is assigned the Installer role on the device.
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Inspect directory access permissionsReview the directory access control lists or file system permissions configured in the REB500. Compare the allowed directories for Installer role against expected boundaries.Affected if Installer role is configured to access directories beyond its intended scope, or if directory restrictions are absent/misconfigured.
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Review access logs for directory traversalExamine authentication and access logs for the REB500, looking for requests from Installer-role users accessing directories outside the expected Installer scope. Filter for file system or directory-related operations.Affected if Logs show Installer role users accessing directories outside their designated permission set.
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Check for privilege escalation indicatorsLook for audit logs or security events indicating vertical privilege escalation attempts, or modifications to files/configs in directories not normally accessible to Installer role.
You are affected if you have a REB500 device running firmware version 8.3.3.0 or lower with any user assigned the Installer role, and you observe directory access beyond the Installer role's intended permissions.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement proper directory-level authorization checks to enforce role-based access control boundaries. Until a patch is available, limit Installer role assignments to trusted personnel and implement monitoring/alerts for unauthorized directory access attempts.
- Consultation3.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,720.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-2459 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-2459 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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