Is CVE-2026-2459 actively exploited?

No active exploitation of CVE-2026-2459 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-2459 be exploited remotely?

Yes. CVE-2026-2459 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-2459?

CVE-2026-2459 has a CVSS score of 8.1 (HIGH) and an EPSS exploitation probability of 0.04%.

HOME VULNERABILITIESCVE-2026-2459

HIGH

CVE-2026-2459

CWE-267Published: February 24, 2026· Updated: Feb 26, 2026

8.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:10.3th

Official Description

A 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.

NVD Source

Technical Analysis

CVE-2026-2459 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected Vendors & Products

hitachienergy2 products

reb500 firmwarereb500

Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://publisher.hitachienergy.com/preview?DocumentID=8DBD000217&LanguageCode=en&DocumentPartId=&Action=Launch

News & Research Mentioning CVE-2026-2459

Hitachi Energy Relion REB500 Product

CISA Alerts· Mar 3, 2026

View CSAF Summary Hitachi Energy is aware of vulnerabilities that affect the Relion REB500 product versions listed in this document. Authenticated users with certain roles can exploit the vulnerabilities to access and modify the directory contents they are not authorized to do so. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation. The following versions of Hitachi Energy Relion REB500 Product are affected: Relion REB500 vers:Relion_REB500/<=8.3.3.0 (CVE-2026-2459, CVE-2026-2460) CVSS Vendor Equipment Vulnerabilities v3 6.8 Hitachi Energy Hitachi Energy Relion REB500 Product Privilege Defined With Unsafe Actions Background Critical Infrastructure Sectors: Energy Countries/Areas Deployed: Worldwide Compa [xlite_meta score:73 src:CISA Alerts xlite_fp:01f9ac337cc7afeaccdb785798646847715b3ec06a0e0ff9c6ccdd40afcc708b]