CVE-2024-27674: Macro Expert · Incorrect Default Permissions
Source CVE Database V5
Not known to be exploited · CVSS 7.8 High.
Data as of 26 Oct 2026, 10:12 UTC
- 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:HExploitation evidence
Disclosed: evidence found.
CVE published 3 Apr 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
- 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.
- Implement application whitelisting or code integrity policies (e.g., Windows Defender Application Control) to prevent unauthorized binary replacement.
- Monitor the Macro Expert installation directory for unexpected file changes using file integrity monitoring tools.
- Limit local user privileges and enforce the principle of least privilege to reduce the number of users who can access the affected folder.
- If possible, isolate systems running Macro Expert from untrusted users or networks to reduce exposure.
- Engage with the vendor for patches or updates addressing this vulnerability and apply them promptly once available.
- Educate system administrators and users about the risks of local privilege escalation and the importance of secure file permissions.
- 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.