{"basis":"claimed","id":"CVE-2025-31489","name":"MinIO performs incomplete signature validation for unsigned-trailer uploads","vendorProject":"minio","product":"minio","publishedAt":"2025-04-03","cvss":{"score":8.7,"severity":"HIGH","version":"4.0"},"exploited":null,"epss":{"score":0.02519,"percentile":0.84843,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"blocks","firstOn":"2025-05-05","daysToRule":32},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"no_history","firstOn":null,"daysToRule":null},"f5":{"status":"none","firstOn":null,"daysToRule":null},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":"MinIO performs incomplete signature validation for unsigned-trailer uploads","description":"MinIO is a High Performance Object Storage released under GNU Affero General Public License v3.0. The signature component of the authorization may be invalid, which would mean that as a client you can use any arbitrary secret to upload objects given the user already has prior WRITE permissions on the bucket. Prior knowledge of access-key, and bucket name this user might have access\nto - and an access-key with a WRITE permissions is necessary. However with relevant information in place, uploading random objects to buckets is trivial and easy via curl. This issue is fixed in RELEASE.2025-04-03T14-56-28Z.","cwes":["CWE-347"],"vendors":[{"vendor":"cloudflare","status":"blocks","basis":"claimed","firstOn":"2025-05-05","firstIsNew":true,"daysToRule":32,"daysAtMost":null,"freePlan":false,"claims":[{"id":"694c269de18599c84fe92018fa964e517ff816df2cd3f5226d1b4fbf9d4ecee0","cve_id":"CVE-2025-31489","vendor":"cloudflare","product":"Cloudflare Managed Ruleset","rule_id":"5eb7ed601e6844828b9bdb05caa7b208","rule_name":"MinIO - Auth Bypass - CVE:CVE-2025-31489","change":"new","default_action":"Block","published_on":"2025-05-05","source_url":"https://developers.cloudflare.com/changelog/post/2025-05-05-waf-release/","source_title":"WAF Release - 2025-05-05","excerpt":"MinIO - Auth Bypass - CVE:CVE-2025-31489. Previous action: Log. New action: Block. This is a New Detection","first_seen_at":"2026-11-02T21:00:16.558Z"}]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-02T21:16:34.613Z","cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial"},"measured":[{"engineId":"owasp-crs","engineName":"OWASP Core Rule Set","engineVersion":"4.25.0","runtime":"Coraza v3.8.1","config":"paranoia level 1, anomaly threshold 5, default CRS settings","ranAt":"2026-11-02T13:02:57.000Z","verdict":"blocked","templateId":"CVE-2025-31489","templatePath":"http/cves/2025/CVE-2025-31489.yaml","requests":1,"blockedRequests":1,"rules":["911100","920450","920640"],"note":"","requestDetail":[{"method":"PUT","path":"/x/jdj6qqzjr0xryy2mumcxh9vauql.txt","status":403,"blocked":true,"rules":["911100","920450","920640"]}]},{"engineId":"owasp-crs","engineName":"OWASP Core Rule Set","engineVersion":"4.25.0","runtime":"Coraza v3.8.1","config":"paranoia level 2, anomaly threshold 5, default CRS settings","ranAt":"2026-11-02T13:03:28.000Z","verdict":"blocked","templateId":"CVE-2025-31489","templatePath":"http/cves/2025/CVE-2025-31489.yaml","requests":1,"blockedRequests":1,"rules":["911100","920450","920640"],"note":"","requestDetail":[{"method":"PUT","path":"/x/jdj6qqzjr0xryy2mumcxh9vauql.txt","status":403,"blocked":true,"rules":["911100","920450","920640"]}]}],"social":{"total":0,"first_seen":null,"daily":[{"day":"2026-10-21","posts":0},{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0}],"top_posts":[],"exploit_repositories":[]}}