VulnerabilityPublished 26 Mar 2026

CVE-2026-1890: LeadConnector (WordPress plugin) · Missing Authorization

Affects LeadConnector (WordPress plugin)Source CVE Database V5

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Not known to be exploited · public detection template (Nuclei) · CVSS 5.3 Medium : upgrade to 3.0.22 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 52% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.0.22

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Mar 2026
Detectable: evidence found.
nuclei template: LeadConnector < 3.0.22 - Unauthenticated Arbitrary Data Write
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade LeadConnector (WordPress plugin) to 3.0.22.

Affected software

Product	Affected	Fixed in
LeadConnector	Affected <3.0.22	Fixed in 3.0.22

AI-suggested

To mitigate CVE-2026-1890, organizations should immediately verify the LeadConnector plugin version installed on their WordPress sites and upgrade to version 3.0.22 or later where the authorization checks are implemented. If an upgrade is not immediately feasible, administrators should restrict access to the REST API endpoints by implementing web application firewall (WAF) rules that block unauthorized requests to LeadConnector routes. Additionally, monitoring REST API traffic for unusual or unauthorized modification attempts can help detect exploitation attempts early. Employing principle of least privilege on WordPress user roles and disabling unused REST API endpoints can reduce exposure. Regular backups of LeadConnector data are essential to recover from potential data corruption. Finally, organizations should stay informed through vendor advisories and security bulletins for any patches or additional mitigations.

Description

The LeadConnector WordPress plugin before 3.0.22 does not have authorization in a REST route, allowing unauthenticated users to call it and overwrite existing data

Impact

The primary impact of CVE-2026-1890 is unauthorized data modification within the LeadConnector plugin environment. Organizations using vulnerable versions risk attackers overwriting or corrupting data managed by the plugin, potentially leading to inaccurate business records, disrupted workflows, or loss of data integrity. While confidentiality and availability remain unaffected, the integrity compromise can have downstream effects such as erroneous customer information, misconfigured settings, or invalid lead data, which could degrade service quality or trustworthiness. Since exploitation requires no authentication and can be performed remotely, the attack surface is broad, increasing the likelihood of opportunistic attacks. However, the lack of known exploits and the medium severity rating suggest the threat is moderate but should not be ignored. Organizations with high reliance on LeadConnector for customer relationship management or lead tracking may experience operational disruptions or reputational damage if data is manipulated maliciously.

CWE-862Missing Authorization (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #4OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
Architecture and Design
Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries.
Architecture and Design
Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
V7.2.2 (opens in a new tab)
Attack patterns
Exploitation of Thunderbolt Protection Flaws (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

wpscan.com/vulnerability/9b88be70-b5cc-4a3f-a871-64d61cb02076/ (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Mar 2026, 14:02 UTC

Public exploits and detectiona Nuclei detection template

WeaknessesCWE-862

Technical details

References

Community reviews

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