{"vulnerability": "CVE-2026-104803", "sightings": [{"uuid": "45275a90-a6d0-4c43-a7a5-5f8308dbeb2b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-104803", "type": "seen", "source": "https://infosec.exchange/users/cve/statuses/117415549890591555", "content": "CVE-2026-104803 WPCOM Member <= 1.7.27 - Unauthenticated Authentication Bypass via 'uuid' and 'code' Parameters on Social-Login Callback The WPCOM Member plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 1.7.27 via the `uuid` and `code` parameters of the social-login callback handler registered on the `init` hook. The vulnerability exists because the `login` function's social-login flow performs no nonce validation, no OAuth state verification, and no per-visitor namespace isolation in the session store, allowing an unauthenticated attacker to issue a crafted GET request that writes an attacker-named, attacker-valued entry into the global session namespace (bypassing the per-visitor prefix by prepending an underscore), then issue a second GET request triggering `weapp_new_user()` to read that forged entry and resolve the attacker-supplied `openid` value to a bound WordPress account before `wp_set_auth_cookie()` establishes a fully authenticated session. This makes it possible for unauthenticated attackers to log in as any WordPress user \u2014 including administrators \u2014 whose bound social provider identifier (openid/unionid) is known or discoverable. Successful exploitation requires that the target site has at least one social provider configured (which activates the vulnerable handler) and that the attacker knows or can enumerate the victim account's bound openid or unionid.\nhttps://www.cve.org/CVERecord?id=CVE-2026-104803https://www.wordfence.com/threat-intel/vulnerabilities/id/3dee7f76-bd66-4e54-8ef6-bbf581ebcc11?source=cvehttps://plugins.trac.wordpress.org/browser/wpcom-member/tags/1.7.27/includes/social-login.php#L1235https://plugins.trac.wordpress.org/browser/wpcom-member/tags/1.7.27/includes/social-login.php#L91https://plugins.trac.wordpress.org/browser/wpcom-member/tags/1.7.27/includes/social-login.php#L674https://plugins.trac.wordpress.org/browser/wpcom-member/tags/1.7.27/includes/class-sesstion.php#L13https://plugins.trac.wordpress.org/browser/wpcom-member/trunk/includes/social-login.php#wordpress #whyun #WPCOMMember#CVE_2026_104803#bot", "creation_timestamp": "2026-10-10T07:58:29.071573Z"}, {"uuid": "e818bbd1-93b1-4ed3-8ed4-a4fcff54d17c", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-104803", "type": "seen", "source": "https://bsky.app/profile/stackflag.bsky.social/post/3mxj4shy4te2l", "content": "CVE-2026-104803\nThe WPCOM Member add\u2011on for WordPress (versions up to 1.7.27) can be tricked into creating a logged\u2011in session without a password. An attacker who knows a visitor\u2019s social\u2011login identifier can send specially\u2026\n\nToo many irrelevant or confusing CVEs? Use stackflag.com\n\n#CVE #infosec", "creation_timestamp": "2026-10-10T09:00:05.887619Z"}, {"uuid": "39e5d1f0-12c2-433e-bf15-66acab97998a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-104803", "type": "seen", "source": "https://infosec.exchange/users/offseq/statuses/117415793431162883", "content": "WPCOM Member plugin (\u22641.7.27) suffers CRITICAL auth bypass (CVE-2026-104803, CVSS 9.8) \ud83d\udee1\ufe0f. Attackers can impersonate any WordPress user via social-login flaw. Disable social login & check vendor for fixes. https://radar.offseq.com/threat/cve-2026-104803-cwe-287-improper-authentication-in-whyun-wpcom-member-4f47db1288fd1984 #OffSeq #WordPress #Infosec #CVE2026104803", "creation_timestamp": "2026-10-10T09:00:25.330719Z"}, {"uuid": "9c8e2e61-0f2d-4be7-97a0-e9996ee52bae", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-104803", "type": "seen", "source": "https://bsky.app/profile/offseq.bsky.social/post/3mxj4t3xvni2p", "content": "CRITICAL: whyun WPCOM Member WordPress plugin (\u22641.7.27) allows auth bypass via social login flaw. Attackers can access any account. Disable social login & monitor for patches. https://radar.offseq.com/threat/cve-2026-104803-cwe-287-improper-authentication-in-whyun-wpcom-member-4f47db1288fd1984 #O...", "creation_timestamp": "2026-10-10T09:00:28.176684Z"}, {"uuid": "5f416c1b-b952-415c-9aa1-9f7ba0e76942", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-104803", "type": "seen", "source": "https://bsky.app/profile/stemshop.bsky.social/post/3mxjakxteaq2n", "content": "\ud83d\udea8 CVE-2026-104803 \u2014 CVSS 9.8 CRITICAL\n\nThe WPCOM Member plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and inc...\n\n\ud83d\udd0e https://stemshop.top/cve/CVE-2026-104803\n\n#CVE #CyberSecurity #InfoSec", "creation_timestamp": "2026-10-10T10:07:29.067497Z"}, {"uuid": "861fa7df-5f0d-4640-8696-f32a6a8d9601", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-104803", "type": "seen", "source": "https://bsky.app/profile/thehackerwire.bsky.social/post/3mxkbqewt6w2r", "content": "\ud83d\udd34 CVE-2026-104803 - Critical (9.8)\n\nThe WPCOM Member plugin for WordPress is vulnerable to Authentication Bypass in all versions up t...\n\nhttps://www.thehackerwire.com/vulnerability/CVE-2026-104803/\n\n#infosec #cybersecurity #CVE #vulnerability #security #patchstack", "creation_timestamp": "2026-10-10T20:01:04.643745Z"}]}