CVE-2021-47780: Macro Expert 4.7 contains an unquoted service path vulnerability that allows local users to potentially execut

Routine

HIGH 7.8DOWNGRADE

CVE-2021-47780 is a high-severity flaw (CVSS 7.8) affecting macro expert. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Macro Expert 4.7 contains an unquoted service path vulnerability that allows local users to potentially execute arbitrary code with elevated system privileges. Attackers can exploit the improperly configured service path to inject malicious executables that will be run with LocalSystem permissions during service startup.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-428
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: macro-expert

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-16 00:16 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

macro-expert macro expert DOWNGRADE

Affected: 4.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.7

1. Check installed version

apt-cache policy macro-expert || rpm -q macro-expert || macro-expert --version

2. No fixed release: DOWNGRADE to a release before 4.7 (Debian / Ubuntu)

apt-cache madison macro-expert sudo apt install macro-expert=<VERSION_BEFORE_4.7> sudo apt-mark hold macro-expert

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

dnf --showduplicates list macro-expert sudo dnf downgrade macro-expert-<VERSION_BEFORE_4.7> sudo dnf versionlock add macro-expert

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-2021-47780?

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

Is CVE-2021-47780 being exploited?

CVE-2021-47780 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-2021-47780 affect?

CVE-2021-47780 affects macro expert. Severity is high (CVSS 7.8). Macro Expert 4.7 contains an unquoted service path vulnerability that allows local users to potentially execute arbitrary code with elevated system privileges. Attackers can exploit the improperly configured service path to inject malicious

How urgent is CVE-2021-47780?

Priority 36/100. High severity; Public exploit reference

References

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