CVE-2026-86583

8.8 HIGH

Published 2026-09-23 · Updated 2026-09-24

AI risk analysis

Summary: The vulnerability allows authenticated attackers with Subscriber-level access or above to escalate their privileges to Administrator by manipulating CSV files during the export and re-import process of the Import and export users and customers plugin for WordPress.
Exploitability: Exploitation requires a site administrator to trigger the plugin's export re-import migration with specific settings, making it moderately hard to exploit.
Blast radius: If exploited, the attacker can gain full administrative control over the WordPress site, leading to potential data breaches and unauthorized access to sensitive information.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Disable the affected plugin or upgrade to version 2.4.18 or later.

auth-bypasswebcsvwp-plugin

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

The Import and export users and customers plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.4.17 via the plugin's own export and re-import workflow. The vulnerability exists because the exporter writes CSV cells using fputcsv() with a NUL byte (\0) as the escape character, while the importer parses the same file using SplFileObject::fgetcsv() with only a single delimiter argument, causing PHP's default backslash escape character to be applied instead; because the export column layout places display_name immediately before the role column and nickname immediately after, an attacker can store crafted values in those two profile fields — saved by WordPress core via the standard profile page — such that the escape mismatch causes the parser to merge the display_name cell into the role field and rebalance the column count via nickname, yielding administrator as the parsed role for their own row when it reaches the import_user function's add_role function. This makes it possible for authenticated attackers with Subscriber-level access or above to escalate their privileges to Administrator. Exploitation requires a site administrator to trigger the plugin's documented export re-import migration with both "Update existing users" and "Update roles for existing users" set to "yes".

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-266

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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