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TabaPay Gateway EUVDEUVD-2026-62276

| CVE-2026-18031 CRITICAL
Improper Authentication (CWE-287)
2026-08-19 contact@wpscan.com GHSA-37mv-8m3x-7xq5
9.8
CVSS 3.1 · Vendor: wpscan
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Locate WP site with TabaPay Gateway ≤1.4.0
  2. Delivery
    Forge payment callback referencing admin's order
  3. Exploit
    Plugin establishes session without validation
  4. Execution
    Obtain authenticated administrator session
  5. Persist
    Install malicious plugin or web shell
  6. Impact
    Full site takeover

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires that the TabaPay Gateway plugin (≤1.4.0) is installed and active and that its payment callback endpoint is reachable by the attacker - which it is by design, since payment processors post callbacks over the network. The attacker must reference an order that is associated with the target account; a valid or guessable/forgeable order reference for the victim user is the practical prerequisite. Limiting factors: the site must actually run this specific plugin (a niche WooCommerce/WordPress payment integration), and the attacker needs a callback that maps to the intended victim's account, so account takeover is targeted per-order rather than blind. Beyond that, per the CVSS vector (AV:N/AC:L/PR:N/UI:N) there is no authentication and no user interaction required.

Impact

The signals are mixed but lean toward genuine priority for anyone running this plugin. CVSS 3.1 is 9.8 with AV:N/AC:L/PR:N/UI:N - network-reachable, low complexity, no authentication, no user interaction - and impact is Confidentiality/Integrity/Availability all High because logging in as an administrator equals full site takeover. CISA SSVC reinforces this: Automatable=yes and Technical Impact=total, meaning the attack can be scripted at scale and yields complete control. The counterweight is exploitation maturity: SSVC Exploitation=none, there is no CISA KEV listing, and EPSS is only 0.15% (4th percentile), so widespread active exploitation is not currently observed. The low EPSS reflects the plugin's small install base rather than any difficulty of exploitation - the technical bar is very low. Net: not yet actively exploited in the wild, but a high-severity, easily weaponizable auth bypass that should be remediated promptly on any affected site.

Exploit ScenarioDerived

An attacker identifies a WordPress site running TabaPay Gateway ≤1.4.0 and sends a crafted payment-callback request to the plugin's callback endpoint that references an order associated with the site's administrator account. The plugin establishes an authenticated session for that account without verifying the callback, handing the attacker an admin session; from there they install a malicious plugin or web shell for full site compromise. No proof-of-concept is published, but the low attack complexity (AC:L) and lack of required authentication or user interaction make development straightforward.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Aug 19, 2026

Authentication bypass in the TabaPay Gateway WordPress plugin (versions through 1.4.0) lets unauthenticated remote attackers log in as any registered user - including administrators - by abusing the payment callback handler. Because the plugin establishes a session for the account tied to a referenced order without validating the payment callback's authenticity, an attacker who can reach the callback endpoint can impersonate arbitrary accounts. No public exploit identified at time of analysis, and EPSS is low (0.15%, 4th percentile), but the flaw is trivially exploitable and CISA's SSVC framework rates it fully automatable with total technical impact.

RemediationAI

No vendor-released patch identified at time of analysis - the data only bounds the vulnerability as affecting versions through 1.4.0 with no confirmed fixed version, so monitor the WordPress.org plugin page and the WPScan advisory (https://wpscan.com/vulnerability/6576dcd1-aea6-47c0-9157-4ca56f426612/) for a release above 1.4.0 and upgrade as soon as one appears. Until a fix ships, the safest compensating control is to deactivate and remove the TabaPay Gateway plugin, which stops the vulnerable callback handler entirely but disables TabaPay payment processing on the site. If the plugin must stay active, restrict access to the payment callback endpoint at the web-server or WAF layer so it only accepts requests from TabaPay's published callback source IP ranges (trade-off: legitimate callbacks from unlisted IPs will be dropped, breaking payment reconciliation), and audit existing WordPress accounts for unexpected administrator sessions or newly created admin users. Because the flaw grants admin access, also rotate administrator credentials and secret keys after remediation.

Affected VersionsENISA

TabaPay Gateway 0 ≤1.4.0

Affected Packages

euvd tabapay_gateway no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability lives in TabaPay Gateway, a third-party WordPress payment plugin that integrates the TabaPay payment processor into WooCommerce/WordPress checkout flows. Payment gateways typically receive an asynchronous server-to-server 'callback' (webhook/IPN) from the processor confirming a transaction, and the plugin uses that callback to reconcile an order and log the associated customer in. The root cause is CWE-287 (Improper Authentication): the plugin trusts the callback and the order-to-account mapping it references without cryptographically verifying that the callback genuinely originated from TabaPay (e.g., no signature/HMAC or shared-secret validation). As a result, forging or replaying a callback that references an order belonging to any user causes WordPress to establish an authenticated session for that user's account.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (wpscan) PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 9.8 CRITICAL

Unauthenticated network attacker abuses an unvalidated callback (PR:N/UI:N/AC:L) to gain an administrator session, yielding full site control, so C/I/A are all High.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (wpscan).

CVSS VectorVendor: wpscan

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

Lifecycle Timeline

3
CVSS changed
Aug 19, 2026 - 17:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 19, 2026 - 06:17 cve.org
CRITICAL 9.8
CVE Published
Aug 19, 2026 - 06:17 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

The TabaPay Gateway WordPress plugin through 1.4.0 does not validate the payment callback before establishing a session for the account associated with the referenced order, allowing unauthenticated attackers to log in as any registered user, including an administrator.

Executive ViewAI

Why It Matters

The TabaPay Gateway WordPress plugin (versions through 1.4.0) contains a critical authentication bypass that enables unauthenticated attackers to assume control of any user account, including administrator access. Organizations using this plugin face immediate risk of complete site takeover and data compromise. No vendor patch is currently available, requiring urgent mitigation.

Business Impact: Severe
Compensating Controls

Pending vendor patch: immediately disable the vulnerable plugin to eliminate attack surface; implement Web Application Firewall (WAF) rules to block requests to the payment callback endpoint; restrict WordPress instances to trusted network segments only; enable comprehensive authentication logging and configure alerts for anomalous login patterns or privilege escalation attempts.

Threat Intelligence Overview

EPSS Score
0.1%
Top 96% exploitable
Prevalence
Low
niche third-party WordPress/WooCommerce payment gateway plugin, small install base
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.1%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Out-of-Cycle
Exploitation
None
System Exposure· derived
Open
Automatable
Yes
Human Impact
Very High
Technical Impact
Total

Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

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