diff --git a/cves/2020/CVE-2020-13121.yaml b/cves/2020/CVE-2020-13121.yaml
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+id: CVE-2020-13121
+
+info:
+  name: Submitty 20.04.01 - Open redirect
+  author: 0x_Akoko
+  severity: medium
+  description: Submitty through 20.04.01 has an open redirect via authentication/login?old= during an invalid login attempt.
+  reference:
+    - https://github.com/Submitty/Submitty/issues/5265
+    - https://www.cvedetails.com/cve/CVE-2020-13121
+  classification:
+    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
+    cvss-score: 6.10
+    cve-id: CVE-2020-13121
+    cwe-id: CWE-601
+  tags: cve,cve2020,redirect,submitty,oos
+
+requests:
+  - raw:
+      - |
+        POST /authentication/check_login?old=http%253A%252F%252Fexample.com%252Fhome HTTP/1.1
+        Host: {{Hostname}}
+        Origin: {{RootURL}}
+        Content-Type: application/x-www-form-urlencoded
+        Referer: {{RootURL}}/authentication/login
+
+        user_id={{username}}&password={{password}}&stay_logged_in=on&login=Login
+
+    cookie-reuse: true
+    matchers:
+      - type: regex
+        part: header
+        regex:
+          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)?(?:[a-zA-Z0-9\-_\.@]*)interact\.sh\/?(\/|[^.].*)?$' # https://regex101.com/r/ZDYhFh/1