XSS in Formstone

CVE-2020-26768

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.9th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-26768: held from 0.012 to 0.013.

EPSS over last 30 days · oldest: 0.012 · newest: 0.013 · change: +0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2020-26768?
CVE-2020-26768 is a medium-severity vulnerability in Formstone, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-07.
How severe is CVE-2020-26768?
Medium severity. CVSS v3 base score is 6.1 out of 10.