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Fencer Vulns
medium 6.1

CVE-2020-35698 json

Thinkific Thinkific Online Course Creation Platform 1.0 is affected by: Cross Site Scripting (XSS).

published 2023-07-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23357

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

Thinkific Thinkific Online Course Creation Platform 1.0 is affected by: Cross Site Scripting (XSS). The impact is: execute arbitrary code (remote). The component is: Affected Source code of the website CMS which is been used by many to host their online courses using the Thinkific Platform. The attack vector is: To exploit the vulnerability any user has to just visit the link - https://hacktify.thinkific.com/account/billing?success=%E2%80%AA%3Cscript%3Ealert(1)%3C/script%3E. ¶¶ Thinkific is a Website based Learning Platform Product which is used by thousands of users worldwide. There is a Cross Site Scripting (XSS) based vulnerability in the code of the CMS where any attacker can execute a XSS attack. Proof of Concept & Steps to Reproduce: Step1 : Go to Google.com Step 2 : Search for this Dork site:thinkific.com -www Step 3 : You will get a list of websites which are running on the thinkific domains. Step 4 : Create account and signin in any of the website Step 5 : Add this endpoint at the end of the domain and you will see that there is a XSS Alert /account/billing?success=%E2%80%AA<script>alert(1)</script> Step 6 : Choose any domains from google for any website this exploit will work on all the websites as it is a code based flaw in the CMS Step 7 : Thousands of websites are vulnerable due to this vulnerable code in the CMS itself which is giving rise to the XSS attack.

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.