Critical
Group-Office Vulnerable to Remote Code Execution (RCE)
Type: advisorySources: OSV
Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.9, 25.0.87, and 6.8.154 have an authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow. The vulnerable path extracts attacker-controlled files from `winmail.dat` and then invokes `zip` with a shell wildcard (`*`). Because extracted filenames are attacker-controlled, they can be interpreted as `zip` options and lead to arbitrary command execution. Versions 26.0.9, 25.0.87, and 6.8.154 fix the issue.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-27947
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 22:16 UTC · Revision 1
Source evidence
Group-Office Vulnerable to Remote Code Execution (RCE)
core-osv · Original sourcePublished 27 Feb 2026, 19:52 UTC
Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.9, 25.0.87, and 6.8.154 have an authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow. The vulnerable path extracts attacker-controlled files from `winmail.dat` and then invokes `zip` with a shell wildcard (`*`). Because extracted filenames are attacker-controlled, they can be interpreted as `zip` options and lead to arbitrary command execution. Versions 26.0.9, 25.0.87, and 6.8.154 fix the issue.
osv:CVE-2026-27947
Complete source record
{
"id": "b36371e7dbc921af86d3a193bc4803a292d4228e54d17eb65ad862020dd98e1e",
"url": "https://osv.dev/vulnerability/CVE-2026-27947",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Group-Office Vulnerable to Remote Code Execution (RCE)",
"summary": "Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.9, 25.0.87, and 6.8.154 have an authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow. The vulnerable path extracts attacker-controlled files from `winmail.dat` and then invokes `zip` with a shell wildcard (`*`). Because extracted filenames are attacker-controlled, they can be interpreted as `zip` options and lead to arbitrary command execution. Versions 26.0.9, 25.0.87, and 6.8.154 fix the issue.",
"evidence": "osv:CVE-2026-27947",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-27947",
"aliases": [
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"GHSA-2rwh-9qp7-f92x"
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"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
}
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"modified": "2026-10-28T02:30:40.233346647Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27947.json",
"https://github.com/Intermesh/groupoffice/security/advisories/GHSA-2rwh-9qp7-f92x",
"https://nvd.nist.gov/vuln/detail/CVE-2026-27947"
],
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27947.json"
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 507483,
"published_at": "2026-02-27T19:52:41.592+00:00"
}