Is CVE-2026-55878 actively exploited?

No active exploitation of CVE-2026-55878 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55878 be exploited remotely?

No. CVE-2026-55878 requires local access to exploit.

What is the CVSS score of CVE-2026-55878?

CVE-2026-55878 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-55878

HIGH

CVE-2026-55878

CWE-22Published: July 8, 2026· Updated: Jul 10, 2026

7.8

CVSS v3.1

EPSS:0.15%probability of exploitation in 30 daysPercentile:4.3th

Official Description

Symfony UX is a JavaScript ecosystem for Symfony. From 2.32.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux:install console command installs files from a recipe kit by copying paths listed in a copy-files map, and because Path::isRelative() accepts paths like ../../../etc, a crafted or compromised kit can write attacker-controlled content to arbitrary locations or read local files outside the recipe directory. This issue is fixed in versions 2.36.1 and 3.2.0.

NVD Source

Technical Analysis

CVE-2026-55878 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.