CVE-2020-7776: Phpoffice Phpspreadsheet

Medium severity, CVSS 6.4. EPSS: 1.3% chance of exploitation in the next 30 days.

This affects the package phpoffice/phpspreadsheet from 0.0.0. The library is vulnerable to XSS when creating an html output from an excel file by adding a comment on any cell. The root cause of this issue is within the HTML writer where user comments are concatenated as part of link and this is returned as HTML. A fix for this issue is available on commit 0ed5b800be2136bcb8fa9c1bdf59abc957a98845/master branch.

Affected products

• Phpoffice Phpspreadsheet: before 1.16.0 (fixed in 1.16.0)

Published 2020-12-09. Last modified 2026-06-17.