{"id":28396,"date":"2026-09-25T00:31:24","date_gmt":"2026-09-24T16:31:24","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-91187"},"modified":"2026-09-25T00:31:24","modified_gmt":"2026-09-24T16:31:24","slug":"cve-2026-91187","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-91187","title":{"rendered":"CVE-2026-91187 &#8211; Improper Verification of Cryptographic Signature vulnerability in dashbit nimble_zta allow"},"content":{"rendered":"<p>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.<\/p>\n<p>verify_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.<\/p>\n<p>This issue affects nimble_zta: from 0.1.2 before 0.1.3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Improper Verification of Cryptographic Signature vulnerability in dashbit nimble_zta allows an unauthenticated remote attacker to authenticate as an arbitrary Cloudflare service token. Applications us<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28396","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28396","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}