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CVE-2026-21881

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:13cba8b2140aff3b5a2525c1e4d5b4fbb0cfd08c7796444052cc499999edf6cc
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"kanboard","vendor":"kanboard","versions":[{"status":"affected","version":"< 1.2.49"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7e7d5945b46def70545d983a6dd306950515f5624a6deadf0fb7aec099cb89b4 · sha256:8b295ecb64427d82… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7e7d5945b46def70545d983a6dd306950515f5624a6deadf0fb7aec099cb89b4 · sha256:8b295ecb64427d82… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7e7d5945b46def70545d983a6dd306950515f5624a6deadf0fb7aec099cb89b4 · sha256:8b295ecb64427d82… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/kanboard/kanboard/commit/7af6143e2ad25b5c15549cca8af4341c7ac4e2fc","tags":["x_refsource_MISC"],"url":"https://github.com/kanboard/kanboard/commit/7af6143e2ad25b5c15549cca8af4341c7ac4e2fc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7e7d5945b46def70545d983a6dd306950515f5624a6deadf0fb7aec099cb89b4 · sha256:8b295ecb64427d82… · /containers/cna/references/1
{"name":"https://github.com/kanboard/kanboard/releases/tag/v1.2.49","tags":["x_refsource_MISC"],"url":"https://github.com/kanboard/kanboard/releases/tag/v1.2.49"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7e7d5945b46def70545d983a6dd306950515f5624a6deadf0fb7aec099cb89b4 · sha256:8b295ecb64427d82… · /containers/cna/references/2
{"name":"https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7e7d5945b46def70545d983a6dd306950515f5624a6deadf0fb7aec099cb89b4 · sha256:8b295ecb64427d82… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7e7d5945b46def70545d983a6dd306950515f5624a6deadf0fb7aec099cb89b4 · sha256:8b295ecb64427d82… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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