CVE-2020-35698: Thinkific Thinkific Online Course Creation Platform 1.0 is affected by: Cross Site Scripting (XSS)

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-35698 is a medium-severity flaw (CVSS 6.1) affecting thinkific. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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%3Csc

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-07-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: thinkific

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-25 20:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

thinkific thinkific DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy thinkific || rpm -q thinkific || thinkific --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison thinkific sudo apt install thinkific=<VERSION_BEFORE_1.0> sudo apt-mark hold thinkific

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list thinkific sudo dnf downgrade thinkific-<VERSION_BEFORE_1.0> sudo dnf versionlock add thinkific

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-35698?

thinkific: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35698 being exploited?

CVE-2020-35698 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-35698 affect?

CVE-2020-35698 affects thinkific. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2020-35698?

Priority 32/100. No elevated risk signals yet.

References

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