CVE-2025-55076: A local privilege escalation vulnerability exists in the InstallationHelper service included with Plugin Allia

Routine

MEDIUM 6.2DOWNGRADE

CVE-2025-55076 is a medium-severity flaw (CVSS 6.2) affecting installation manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A local privilege escalation vulnerability exists in the InstallationHelper service included with Plugin Alliance Installation Manager v1.4.0 for macOS. The service accepts unauthenticated XPC connections and executes input via system(), which may allow a local user to execute arbitrary commands with root privileges.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-269
Published	2025-12-03
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: plugin-alliance

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-03 17:15 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

plugin-alliance installation manager DOWNGRADE

Affected: 1.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.0

1. Check installed version

apt-cache policy installation-manager || rpm -q installation-manager || installation-manager --version

2. No fixed release: DOWNGRADE to a release before 1.4.0 (Debian / Ubuntu)

apt-cache madison installation-manager sudo apt install installation-manager=<VERSION_BEFORE_1.4.0> sudo apt-mark hold installation-manager

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list installation-manager sudo dnf downgrade installation-manager-<VERSION_BEFORE_1.4.0> sudo dnf versionlock add installation-manager

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-55076?

installation manager: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-55076 being exploited?

CVE-2025-55076 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-55076 affect?

CVE-2025-55076 affects installation manager. Severity is medium (CVSS 6.2). A local privilege escalation vulnerability exists in the InstallationHelper service included with Plugin Alliance Installation Manager v1.4.0 for macOS. The service accepts unauthenticated XPC connections and executes input via system(), wh

How urgent is CVE-2025-55076?

Priority 29/100. Public exploit reference

Software pages

macOS vulnerabilities

References

← Back to latest CVEs