Is CVE-2026-27178 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-27178, but active exploitation has not been confirmed.

Can CVE-2026-27178 be exploited remotely?

Yes. CVE-2026-27178 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27178?

CVE-2026-27178 has a CVSS score of 7.2 (HIGH) and an EPSS exploitation probability of 0.03%.

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HIGHPOC

CVE-2026-27178

CWE-79Published: February 18, 2026· Updated: Feb 20, 2026

7.2

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:18.1th

Official Description

MajorDoMo (aka Major Domestic Module) contains a stored cross-site scripting (XSS) vulnerability through method parameter injection into the shoutbox. The /objects/?method= endpoint allows unauthenticated execution of stored methods with attacker-controlled parameters. Default methods such as ThisComputer.VolumeLevelChanged pass the user-supplied VALUE parameter directly into the say() function, which stores the message raw in the shouts database table without escaping. The shoutbox widget renders stored messages without sanitization in both PHP rendering code and HTML templates. Because the dashboard widget auto-refreshes every 3 seconds, the injected script executes automatically when any administrator loads the dashboard, enabling session hijack through cookie exfiltration.

NVD Source

Technical Analysis

CVE-2026-27178 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

A proof-of-concept (PoC) exploit exists for CVE-2026-27178. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.