CVE-2026-21881
criticalpriority · track · 0EPSS 0.005 · 42 %ileEUUSEPSS · scored 2026-10-27
Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below is vulnerable to a critical authentication bypass when REVERSE_PROXY_AUTH is enabled. The application blindly trusts HTTP headers for user authentication without verifying the request originated from a trusted reverse proxy. An attacker can impersonate any user, including administrators, by simply sending a spoofed HTTP header. This issue is fixed in version 1.2.49.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.3–9.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://github.com/kanboard/kanboard/commit/7af6143e2ad25b5c15549cca8af4341c7ac4e2fccnnvd
- https://github.com/kanboard/kanboard/releases/tag/v1.2.49cnnvd
- https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739wcnnvd
- https://kanboard.org/releases.htmlPatchcnnvd
- https://github.com/kanboard/kanboard/commit/7af6143e2ad25b5c15549cca8af4341c7ac4e2fcenisa_euvd
- https://github.com/kanboard/kanboard/releases/tag/v1.2.49enisa_euvd
- https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739wenisa_euvd
- https://github.com/kanboard/kanboard/commit/7af6143e2ad25b5c15549cca8af4341c7ac4e2fcPatchnvd
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