CVE-2020-26768 Formstone Vulnerable to Reflected XSS
A reflected XSS vulnerability in Formstone allows attackers to execute scripts in victims' browsers, potentially stealing credentials or forcing malware execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-26768?
CVE-2020-26768 is a medium-severity cross-site scripting vulnerability in n/a, published on 7 Jan 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Formstone <=1.4.16 is vulnerable to a Reflected Cross-Site Scripting (XSS) vulnerability caused by improper validation of user supplied input in the upload-target.php and upload-chunked.php files. A remote attacker could exploit this vulnerability using a specially crafted URL to execute a script in a victim's Web browser within the security context of the hosting Web site once the URL is clicked or visited. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials, force malware execution, user redirection and others.
Weakness: CWE-79
Which versions are affected by CVE-2020-26768?
2 open source packages ship an affected version, including formstone. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
formstone npm | All versions | 1.4.17 |
formstone npm | All versions | 1.4.17 |
Products include Formstone Formstone.
How do I fix CVE-2020-26768?
Upgrade formstone to 1.4.17 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-26768 being exploited?
There is no known exploitation of CVE-2020-26768 in the wild and no public exploit code.
Sources
Also known as GHSA-wc29-h54q-q8qx.