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CVE-2026-21881: Improper Authentication

🗓️ 08 Jan 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 7 Views

Kanboard <=1.2.48 authentication bypass via spoofed headers when REVERSE_PROXY_AUTH is on.

Related
Refs
ReporterTitlePublishedViews
Family
githubexploit
GithubExploit
Exploit for CVE-2026-21879
7 Jan 202606:19
–githubexploit
circl
Circl
CVE-2026-21881
8 Jan 202602:56
–circl
cnnvd
CNNVD
Kanboard security vulnerabilities
8 Jan 202600:00
–cnnvd
cve
CVE
CVE-2026-21881
8 Jan 202601:08
–cve
cvelist
Cvelist
CVE-2026-21881 Kanboard is Vulnerable to Reverse Proxy Authentication Bypass
8 Jan 202601:08
–cvelist
debiancve
Debian CVE
CVE-2026-21881
8 Jan 202601:08
–debiancve
euvd
EUVD
EUVD-2026-1668
8 Jan 202601:08
–euvd
mend
Mend
CVE-2026-21881
8 Jan 202601:08
–mend
nvd
NVD
CVE-2026-21881
8 Jan 202602:15
–nvd
osv_cve
osv_cve
CVE-2026-21881 Kanboard is Vulnerable to Reverse Proxy Authentication Bypass
8 Jan 202601:08
–osv_cve
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20 Jan 2026 00:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.19.1
EPSS0.00486
SSVC
7