{"id":81663,"date":"2026-07-08T00:48:45","date_gmt":"2026-07-07T21:18:45","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-55418-fastgpt-s3-presign-read-handlers-do-not-bind-the-object-key-to-the-callers-team-cross-team-file-disclosure\/"},"modified":"2026-07-08T00:48:45","modified_gmt":"2026-07-07T21:18:45","slug":"cve-2026-55418-fastgpt-s3-presign-read-handlers-do-not-bind-the-object-key-to-the-callers-team-cross-team-file-disclosure","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-55418-fastgpt-s3-presign-read-handlers-do-not-bind-the-object-key-to-the-callers-team-cross-team-file-disclosure\/","title":{"rendered":"CVE-2026-55418 &#8211; FastGPT: S3 presign\/read handlers do not bind the object key to the caller&#8217;s team (cross-team file disclosure)"},"content":{"rendered":"<p>CVE ID :CVE-2026-55418<\/p>\n<p>  Published : July 7, 2026, 9:18 p.m. | 29\u00a0minutes ago<\/p>\n<p>  Description :FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key belongs to the caller&#8217;s team. Because S3 object keys are global within the bucket and carry the tenant id only as a path segment, an attacker can supply another team&#8217;s key and obtain its file contents through the chat-file presign endpoint or dataset preview endpoint. This issue is fixed in version v4.15.0-beta5.<\/p>\n<p>  Severity: 0.0 | NA<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-55418 Published : July 7, 2026, 9:18 p.m. | 29\u00a0minutes ago Description :FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-81663","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81663","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=81663"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81663\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=81663"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=81663"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=81663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}