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CVE-2026-77000 – Authentication Bypass (Full Account Takeover) – WP Social Media Login WordPress Plu

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Summary

CVE-2026-77000 is a critical improper authentication vulnerability (CWE-287) affecting the WP Social Media Login WordPress plugin, versions up to and including 1.0.6. The plugin fails to verify that a social login flow was actually completed with the external identity provider (e.g., Facebook, Google) before establishing an authenticated session, allowing an unauthenticated remote attacker to log in as any existing user — including administrators — by simply supplying that user’s email address. The flaw carries a CVSS v3.1 base score of 9.8 (Critical) and requires no authentication or user interaction to exploit.

Technical details

  • Root cause: The plugin’s social login handler completes the authentication process (issuing a logged-in session) based on user-supplied data without cryptographically or otherwise verifying that the identity provider (social network) actually confirmed the user’s identity.
  • Trigger conditions: An attacker only needs to know or guess the email address of a target WordPress user (site administrators’ emails are often discoverable via author archives, WHOIS, or OSINT).
  • Attack vector: Network-based, unauthenticated, no user interaction required — the attacker directly invokes the plugin’s login endpoint/flow with the victim’s email address instead of completing a legitimate social provider handshake.
  • Impact: Full authentication bypass resulting in complete account takeover, including of administrator accounts. This can lead to full compromise of the WordPress site — arbitrary content changes, installation of malicious plugins/themes, and potential remote code execution via the WordPress admin panel.

Affected software

  • Product: WP Social Media Login (WordPress plugin)
  • Affected versions: All versions through 1.0.6 (0 – 1.0.6 inclusive)

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No patched version has been publicly documented as of this writing. Security teams should check the WordPress.org plugin repository for an update beyond version 1.0.6 and apply it as soon as it becomes available.
  • If no patch is available:
    • Deactivate and remove the WP Social Media Login plugin from all WordPress installations until a fix is released.
    • Enforce multi-factor authentication for all privileged (administrator/editor) accounts to reduce the impact of any single-factor authentication bypass.
    • Monitor authentication logs for anomalous logins, particularly logins to administrator accounts that do not correspond to a legitimate social-provider redirect/callback.
    • Restrict or monitor access to the plugin’s login/callback endpoints via a web application firewall (WAF) as a compensating control.

References

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