Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-30884— mdjnelson/moodle-mod_customcert Vulnerable to Authorization Bypass Through User-Controlled Key

Quick assessment

Affected
mdjnelson moodle-mod_customcert
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Custom certificate activity是Mark Nelson个人开发者的一个动态生成可定制PDF证书的插件。 Custom certificate activity 4.4.9之前版本和5.0.3之前版本存在安全漏洞，该漏洞源于core_get_fragment回调和mod_customcert_save_element Web服务未验证提供的elementid是否属于授权上下文，可能导致跨课程信息泄露和数据篡改。

CVSS 9.6 · Critical EPSS 0.29% · P19
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-30884

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
mdjnelson/moodle-mod_customcert Vulnerable to Authorization Bypass Through User-Controlled Key
Source: CVE Program / CVE List V5
Vulnerability Description
mdjnelson/moodle-mod_customcert is a Moodle plugin for creating dynamically generated certificates with complete customization via the web browser. Prior to versions 4.4.9 and 5.0.3, a teacher who holds `mod/customcert:manage` in any single course can read and silently overwrite certificate elements belonging to any other course in the Moodle installation. The `core_get_fragment` callback `editelement` and the `mod_customcert_save_element` web service both fail to verify that the supplied `elementid` belongs to the authorized context, enabling cross-course information disclosure and data tampering. Versions 4.4.9 and 5.0.3 fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Custom certificate activity 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Custom certificate activity是Mark Nelson个人开发者的一个动态生成可定制PDF证书的插件。 Custom certificate activity 4.4.9之前版本和5.0.3之前版本存在安全漏洞，该漏洞源于core_get_fragment回调和mod_customcert_save_element Web服务未验证提供的elementid是否属于授权上下文，可能导致跨课程信息泄露和数据篡改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Shenlong Deep Dive — AI Deep Analysis

10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.

Read summary Full analysis (login)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mdjnelson moodle-mod_customcert < 4.4.9 -

II. Public POCs for CVE-2026-30884

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-30884

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-30884 (2)

Vendor Advisories for CVE-2026-30884 (1)

IV. Related Vulnerabilities

Same weakness: CWE-639

V. Comments for CVE-2026-30884

No comments yet

Leave a comment