TI-2026-73803 Aliases CVE-2026-100193 GHSA-4vgh-wm7j-x4jg

Reflected cross-site scripting in Tutor LMS via tab parameter

LOW 21CWE-79Published 2026-10-14 · Updated 2026-10-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: High
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Tutor LMS, the eLearning and online course plugin for WordPress, is affected in all versions up to and including 4.1.0. Insufficient input sanitization and output escaping of the 'tab' parameter (CWE-79) allow reflected cross-site scripting. An unauthenticated attacker can inject scripts that run if they trick a user into clicking a link, and this requires a lesson page with an empty nav-items array.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'tab' parameter in all versions up to, and including, 4.1.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires the targeted lesson page to have an empty nav-items array — a condition that occurs naturally when a lesson has no post content, no attachments, and comments are disabled or the viewer is not logged in — which bypasses the in_array() tab validation and allows the raw attacker-controlled value to reach the sink.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00243 15th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
themeum	Tutor LMS – eLearning and online course solution	up to 4.1.0	—	No fix listed	CNA

Tutor LMS – eLearning and online course solution Vendorthemeum Affected up to 4.1.0 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:themeum:tutor_lms::::::::	—	—	themeum

cpe:2.3:a:themeum:tutor_lms:*:*:*:*:*:*:*:* Versions — — ·themeum

Remediation

The sources list no fixed version for Tutor LMS (eLearning and online course solution).

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-14 Threatist record created from CVE-2026-100193
2026-10-14 Alias added: GHSA-4vgh-wm7j-x4jg
2026-10-15 CISA SSVC decision points changed

References

Other 5

TI-2024-09629 Tutor LMS <= 2.7.6 - Unauthenticated SQL Injection via rating_filter CVSS 3.1HIGH 7.5
TI-2023-02936 Tutor LMS < 2.2.1 - Unauthenticated Access to Tutor LMS Lesson Resources via REST API CVSS 3.1HIGH 7.5
TI-2021-07196 Qubely < 1.8.6 - Unauthenticated Arbitrary E-mail Sending CVSS 3.1HIGH 7.5
TI-2023-05666 WP Crowdfunding < 2.1.9 - Reflected XSS CVSS 3.1MEDIUM 6.1
TI-2023-00225 Tutor LMS < 2.0.10 - Reflected Cross-Site Scripting CVSS 3.1MEDIUM 6.1
TI-2023-04422 Tutor LMS < 2.3.0 - Subscriber+ Stored Cross-Site Scripting CVSS 3.1MEDIUM 5.4

See all 171 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences