CVE-2026-21876
🗓️ 08 Jan 2026 13:55:37Reported by GitHub_MType 
cve🔗 web.nvd.nist.gov📰️ 5 Media mentions👁 267 Views🌐 WEB
| Reporter | Title | Published | Views | Family All 51 |
|---|---|---|---|---|
 | Exploit for CVE-2026-21876 | 7 Jan 202614:48 | – | githubexploit |
 | CVE-2026-4048 | 20 Apr 202613:36 | – | attackerkb |
| CVE-2026-3518 | 20 Apr 202613:29 | – | attackerkb |
| CVE-2026-3519 | 20 Apr 202613:32 | – | attackerkb |
| CVE-2026-3517 | 20 Apr 202613:22 | – | attackerkb |
 | Amazon Linux 2023 : mod_security_crs (ALAS2023-2026-1399) | 5 Feb 202600:00 | – | nessus |
| Debian dla-4488 : modsecurity-crs - security update | 22 Feb 202600:00 | – | nessus |
| Debian dsa-6105 : modsecurity-crs - security update | 21 Jan 202600:00 | – | nessus |
| Linux Distros Unpatched Vulnerability : CVE-2026-21876 | 8 Jan 202600:00 | – | nessus |
 | Important: mod_security_crs | 5 Feb 202600:00 | – | amazon |
10
Node
OR
[
{
"vendor": "coreruleset",
"product": "coreruleset",
"versions": [
{
"version": "< 4.22.0",
"status": "affected"
},
{
"version": "< 3.3.8",
"status": "affected"
}
]
}
]| Parameter | Position | Path | Description | CWE |
|---|---|---|---|---|
| username | request body | /submit | OWASP CRS WAF bypass in multipart processing due to capture-variable overwrite during iteration; vulnerable in CRS versions before 4.22.0 and 3.3.8; PoC demonstrates bypass with username containing non-whitelisted chars. | CWE-794 |
Data
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17 Jun 2026 10:19Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.15.3 - 9.3
EPSS0.17884
SSVC