{"id":"CVE-2026-91187","published":"2026-09-24T14:18:18.667","lastModified":"2026-09-24T19:39:45.600","description":"Improper Verification of Cryptographic Signature vulnerability in dashbit nimble_zta allows an unauthenticated remote attacker to authenticate as an arbitrary Cloudflare service token. Applications using the Cloudflare Zero Trust authentication strategy are affected.\n\nverify_token/2 in lib/nimble_zta/cloudflare.ex matches the result of JOSE.JWT.verify/2 against {_, token, _s}, which discards the boolean verification result and returns the decoded token after a failed signature check. The attacker sends a forged JWT in the cf-access-jwt-assertion header, carrying the expected iss claim and the seven service token claims. verify_iss/2 reads the iss claim from the forged token, so it rejects nothing, and the service token path then returns those claims as the authenticated identity.\n\nThis issue affects nimble_zta: from 0.1.2 before 0.1.3.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-347"],"vendors":[],"products":[],"references":[{"url":"https://cna.erlef.org/cves/CVE-2026-91187.html","tags":[]},{"url":"https://github.com/dashbitco/nimble_zta/commit/6458fd18a5ba41166d4973214c519e98fe05b72d","tags":[]},{"url":"https://github.com/dashbitco/nimble_zta/commit/bc004b70985ae5763901baab3a4e204047899768","tags":[]},{"url":"https://github.com/dashbitco/nimble_zta/security/advisories/GHSA-rj24-g8cc-g7g2","tags":[]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-91187","tags":[]}],"exploitRefs":[{"url":"https://github.com/dashbitco/nimble_zta/commit/6458fd18a5ba41166d4973214c519e98fe05b72d","tags":[]},{"url":"https://github.com/dashbitco/nimble_zta/commit/bc004b70985ae5763901baab3a4e204047899768","tags":[]},{"url":"https://github.com/dashbitco/nimble_zta/security/advisories/GHSA-rj24-g8cc-g7g2","tags":[]}],"hasPoc":true,"ai":null}