diff --git a/2021/3xxx/CVE-2021-3915.json b/2021/3xxx/CVE-2021-3915.json
new file mode 100644
index 00000000000..0f5f924d613
--- /dev/null
+++ b/2021/3xxx/CVE-2021-3915.json
@@ -0,0 +1,89 @@
+{
+    "CVE_data_meta": {
+        "ASSIGNER": "security@huntr.dev",
+        "ID": "CVE-2021-3915",
+        "STATE": "PUBLIC",
+        "TITLE": "Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack"
+    },
+    "affects": {
+        "vendor": {
+            "vendor_data": [
+                {
+                    "product": {
+                        "product_data": [
+                            {
+                                "product_name": "bookstackapp/bookstack",
+                                "version": {
+                                    "version_data": [
+                                        {
+                                            "version_affected": "<",
+                                            "version_value": "21.10.3"
+                                        }
+                                    ]
+                                }
+                            }
+                        ]
+                    },
+                    "vendor_name": "bookstackapp"
+                }
+            ]
+        }
+    },
+    "data_format": "MITRE",
+    "data_type": "CVE",
+    "data_version": "4.0",
+    "description": {
+        "description_data": [
+            {
+                "lang": "eng",
+                "value": "bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type"
+            }
+        ]
+    },
+    "impact": {
+        "cvss": {
+            "attackComplexity": "LOW",
+            "attackVector": "NETWORK",
+            "availabilityImpact": "HIGH",
+            "baseScore": 7.6,
+            "baseSeverity": "HIGH",
+            "confidentialityImpact": "HIGH",
+            "integrityImpact": "LOW",
+            "privilegesRequired": "LOW",
+            "scope": "UNCHANGED",
+            "userInteraction": "REQUIRED",
+            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:H",
+            "version": "3.0"
+        }
+    },
+    "problemtype": {
+        "problemtype_data": [
+            {
+                "description": [
+                    {
+                        "lang": "eng",
+                        "value": "CWE-434 Unrestricted Upload of File with Dangerous Type"
+                    }
+                ]
+            }
+        ]
+    },
+    "references": {
+        "reference_data": [
+            {
+                "name": "https://huntr.dev/bounties/fcb65f2d-257a-46f4-bac9-f6ded5649079",
+                "refsource": "CONFIRM",
+                "url": "https://huntr.dev/bounties/fcb65f2d-257a-46f4-bac9-f6ded5649079"
+            },
+            {
+                "name": "https://github.com/bookstackapp/bookstack/commit/ae155d67454d6b9f6c93b2bb457aaa4b2eb1a9ed",
+                "refsource": "MISC",
+                "url": "https://github.com/bookstackapp/bookstack/commit/ae155d67454d6b9f6c93b2bb457aaa4b2eb1a9ed"
+            }
+        ]
+    },
+    "source": {
+        "advisory": "fcb65f2d-257a-46f4-bac9-f6ded5649079",
+        "discovery": "EXTERNAL"
+    }
+}