Publish GHSA-hm8f-75xx-w2vr

Author: advisory-database[bot]

advisories/github-reviewed/2026/01/GHSA-hm8f-75xx-w2vr/GHSA-hm8f-75xx-w2vr.json

@@ -0,0 +1,65 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-hm8f-75xx-w2vr",
+  "modified": "2026-01-26T21:34:50Z",
+  "published": "2026-01-26T21:34:50Z",
+  "aliases": [
+    "CVE-2026-24408"
+  ],
+  "summary": "sigstore CSRF possibility in OIDC authentication during signing",
+  "details": "### Summary\n\nThe sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery.\n\n### Details\n\n`_OAuthSession` creates a unique \"state\" and sends it as a parameter in the authentication request but the \"state\" in the server response seems not not be cross-checked with this value. \n\nFix should be fairly trivial.\n\n### Impact\n\nThis should be low impact: A man-in-the middle attacker could trick a sigstore-python user into signing something with an identity controlled by the attacker (by returning the response to an authentication request they created). This would be quite confusing but not dangerous.",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "PyPI",
+        "name": "sigstore"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "4.2.0"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vr"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aa"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/sigstore/sigstore-python"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-352"
+    ],
+    "severity": "LOW",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-01-26T21:34:50Z",
+    "nvd_published_at": null
+  }
+}