Unauthenticated custom-value overwrite via unchecked REST route
Published Mar 26, 2026 · Updated Mar 26, 2026
Missing authorization in the LeadConnector WordPress plugin before 3.0.22 allows remote attackers to overwrite custom-value data. The lc_internal_api/v1/save_custom_values REST route accepts attacker-supplied fieldKey and id values without checking authorization, then writes them to the wp_lc_custom_values table. No authentication or user interaction is required; a network request can create or replace custom-value records, with no reported confidentiality or availability impact.
Summary
What happened
Missing authorization in the LeadConnector WordPress plugin before 3.0.22 allows remote attackers to overwrite custom-value data. The lc_internal_api/v1/save_custom_values REST route accepts attacker-supplied fieldKey and id values without checking authorization, then writes them to the wp_lc_custom_values table. No authentication or user interaction is required; a network request can create or replace custom-value records, with no reported confidentiality or availability impact.
The record
- CVE
- CVE-2026-1890
- Published
- Mar 26, 2026
- Updated
- Mar 26, 2026
- Vendor
- LeadConnector
- Product
- LeadConnector
- Classifications
- CWE-862, T1190, T1565.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 26, 2026CVE publishedPublication date reported by the CVE source.
- Mar 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.0.22
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- WPScan curl proof of conceptproof of concept · validated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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