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Publish Advisories
GHSA-6m8w-jc87-6cr7 GHSA-qgp8-v765-qxx9 GHSA-vh4h-fvqf-q9wv GHSA-vh4h-fvqf-q9wv
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advisory-database[bot]
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{
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"schema_version": "1.4.0",
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"id": "GHSA-qgp8-v765-qxx9",
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"modified": "2025-05-01T17:01:42Z",
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"published": "2025-05-01T17:01:42Z",
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"aliases": [
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"CVE-2025-4144"
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],
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"summary": "@cloudflare/workers-oauth-provider PKCE bypass via downgrade attack",
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"details": "### Summary\nPKCE was implemented in the OAuth implementation in workers-oauth-provider that is part of[ MCP framework](https://github.com/cloudflare/workers-mcp). However, it was found that an attacker could cause the check to be skipped.\n\n### Impact\nPKCE is a defense-in-depth mechanism against certain kinds of attacks and was an optional extension in OAuth 2.0 which became required in the OAuth 2.1 draft. (Note that the MCP specification requires OAuth 2.1.)\nThis bug completely bypasses PKCE protection.\n\n\n### Patches\nFixed in: https://github.com/cloudflare/workers-oauth-provider/pull/27\n\nWe patched up the vulnerabilities in the latest version, v 0.0.5 of the Workers OAuth provider (https://www.npmjs.com/package/@cloudflare/workers-oauth-provider). You'll need to update your MCP servers to use that version to resolve the vulnerability.\n\n### Workarounds\nNone",
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"severity": [
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{
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"type": "CVSS_V4",
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"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "npm",
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"name": "@cloudflare/workers-oauth-provider"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "0.0.5"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "WEB",
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"url": "https://github.com/cloudflare/workers-oauth-provider/security/advisories/GHSA-qgp8-v765-qxx9"
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},
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{
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"type": "ADVISORY",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-4144"
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},
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{
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"type": "WEB",
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"url": "https://github.com/cloudflare/workers-oauth-provider/pull/27"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/cloudflare/workers-oauth-provider"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-287"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2025-05-01T17:01:42Z",
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"nvd_published_at": null
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}
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}
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{
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"schema_version": "1.4.0",
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"id": "GHSA-vh4h-fvqf-q9wv",
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"modified": "2025-05-01T17:01:34Z",
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"published": "2025-05-01T03:31:17Z",
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"withdrawn": "2025-05-01T17:01:33Z",
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"aliases": [],
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"summary": "Duplicate Advisory: @cloudflare/workers-oauth-provider PKCE bypass via downgrade attack",
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"details": "# Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-qgp8-v765-qxx9. This link is maintained to preserve external references.\n\n# Original Description\nPKCE was implemented in the OAuth implementation in workers-oauth-provider that is part of MCP framework https://github.com/cloudflare/workers-mcp . However, it was found that an attacker could cause the check to be skipped.\n\n\nFixed in:\n\n \n\n https://github.com/cloudflare/workers-oauth-provider/pull/27 https://github.com/cloudflare/workers-oauth-provider/pull/27 \n\n\nImpact: \n\nPKCE is a defense-in-depth mechanism against certain kinds of attacks and was an optional extension in OAuth 2.0 which became required in the OAuth 2.1 draft. (Note that the MCP specification requires OAuth 2.1.). This bug completely bypasses PKCE protection.",
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"severity": [
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{
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"type": "CVSS_V4",
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"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "npm",
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"name": "@cloudflare/workers-oauth-provider"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "0.0.5"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "ADVISORY",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-4144"
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},
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{
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"type": "WEB",
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"url": "https://github.com/cloudflare/workers-oauth-provider/pull/27"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-287"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2025-05-01T17:01:33Z",
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"nvd_published_at": "2025-05-01T01:15:54Z"
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}
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}
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{
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"schema_version": "1.4.0",
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"id": "GHSA-vh4h-fvqf-q9wv",
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"modified": "2025-05-01T03:31:17Z",
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"published": "2025-05-01T03:31:17Z",
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"aliases": [
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"CVE-2025-4144"
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],
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"details": "PKCE was implemented in the OAuth implementation in workers-oauth-provider that is part of MCP framework https://github.com/cloudflare/workers-mcp . However, it was found that an attacker could cause the check to be skipped.\n\n\nFixed in:\n\n \n\n https://github.com/cloudflare/workers-oauth-provider/pull/27 https://github.com/cloudflare/workers-oauth-provider/pull/27 \n\n\nImpact: \n\nPKCE is a defense-in-depth mechanism against certain kinds of attacks and was an optional extension in OAuth 2.0 which became required in the OAuth 2.1 draft. (Note that the MCP specification requires OAuth 2.1.). This bug completely bypasses PKCE protection.",
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"severity": [
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{
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"type": "CVSS_V4",
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"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber"
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}
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],
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"affected": [],
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"references": [
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{
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"type": "ADVISORY",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-4144"
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},
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{
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"type": "WEB",
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"url": "https://github.com/cloudflare/workers-oauth-provider/pull/27"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-287"
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],
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"severity": "MODERATE",
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"github_reviewed": false,
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"github_reviewed_at": null,
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"nvd_published_at": "2025-05-01T01:15:54Z"
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}
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}
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