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VulnerabilityPublished Updated

CVE-2024-27674: Macro Expert · Incorrect Default Permissions

Source CVE Database V5

0

Not known to be exploited · CVSS 7.8 High.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Apr 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

AI-suggested

  1. Immediately audit and restrict NTFS permissions on the "%PROGRAMFILES(X86)%\GrassSoft\Macro Expert" folder to remove modify (M) permissions from the BUILTIN\Users group. Only trusted administrators should have write access.
  2. Implement application whitelisting or code integrity policies (e.g., Windows Defender Application Control) to prevent unauthorized binary replacement.
  3. Monitor the Macro Expert installation directory for unexpected file changes using file integrity monitoring tools.
  4. Limit local user privileges and enforce the principle of least privilege to reduce the number of users who can access the affected folder.
  5. If possible, isolate systems running Macro Expert from untrusted users or networks to reduce exposure.
  6. Engage with the vendor for patches or updates addressing this vulnerability and apply them promptly once available.
  7. Educate system administrators and users about the risks of local privilege escalation and the importance of secure file permissions.
  8. Consider deploying endpoint detection and response (EDR) solutions to detect anomalous behavior indicative of exploitation attempts.

Description

Macro Expert through 4.9.4 allows BUILTIN\Users:(OI)(CI)(M) access to the "%PROGRAMFILES(X86)%\GrassSoft\Macro Expert" folder and thus an unprivileged user can escalate to SYSTEM by replacing the MacroService.exe binary.

References

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