CVE-2026-90989

Tainacan < 1.4.0 - Authenticated (Subscriber+) Information Exposure

2026-10-14 00:00

Strategic Overview

Status: Patched in 1.4.0
Affected Plugin: Tainacan
Affected Version: < 1.4.0
CVSS: 4.3Medium
Weakness type: CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
CVE: CVE-2026-90989

At a glance

CVE-2026-90989 is a medium-severity Exposure of Sensitive Information to an Unauthorized Actor vulnerability in the Tainacan WordPress plugin, affecting versions < 1.4.0. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 1.4.0; sites on affected versions should update now. Disclosed October 2026, reported by Artus KG.

Vulnerability Overview

The Tainacan plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to 1.4.0. This makes it possible for authenticated attackers, with subscriber-level access and above, to extract sensitive user or configuration data.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Reaching this weakness in Tainacan < 1.4.0 takes an account at Subscriber level or above. Sensitive information exposure means data the application intended to keep internal is returned to a caller who should not be able to see it.

The disclosed data — credentials, tokens, customer records or internal paths — is usually worth more as material for a follow-up attack than as an end in itself. For Tainacan the fix is 1.4.0: builds < 1.4.0 are affected, anything from 1.4.0 onward is not.

Remediation

Update to version 1.4.0, or a newer patched version

How does WordSec protect against this?

The fix is the thing that ends this: Tainacan 1.4.0 closes this, and updating the plugin is the step that ends it.

Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-90989 https://www.wordfence.com/threat-intel/vulnerabilities/id/b9942c7b-f51f-471d-ad80-5c658e177b21 https://nvd.nist.gov/vuln/detail/CVE-2026-90989

Related records

Same weakness class

5.3CVE-2024-1435: Tainacan <= 0.20.6 Sensitive Information ExposureCVE-2024-1435

Other vulnerabilities in Tainacan

CVSS Vector

4.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityNone

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