CVE-2020-7776

Name: CVE-2020-7776
Creator: NVD / NIST
Published: 2020-12-09T17:15:31.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.4/10EPSS 1.30%

Last modified Jun 17, 2026

CVE-2020-7776 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. 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. EPSS estimates a 1.30% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS Probability

1.30%

66.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Phpoffice	Phpspreadsheet	< 1.16.0

References

https://github.com/PHPOffice/PhpSpreadsheet/blob/master/src/PhpSpreadsheet/Writer/Html.php%23L1792Broken Link
https://github.com/PHPOffice/PhpSpreadsheet/commit/0ed5b800be2136bcb8fa9c1bdf59abc957a98845Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-PHP-PHPOFFICEPHPSPREADSHEET-1048856Exploit, Third Party Advisory
https://github.com/PHPOffice/PhpSpreadsheet/blob/master/src/PhpSpreadsheet/Writer/Html.php%23L1792Broken Link
https://github.com/PHPOffice/PhpSpreadsheet/commit/0ed5b800be2136bcb8fa9c1bdf59abc957a98845Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-PHP-PHPOFFICEPHPSPREADSHEET-1048856Exploit, Third Party Advisory

Timeline

Published: Dec 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-7776?

How severe is CVE-2020-7776?

CVE-2020-7776 has a CVSS score of 6.4/10 (MEDIUM severity). The EPSS model estimates a 1.30% probability of exploitation in the next 30 days.

How do I fix CVE-2020-7776?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-7776?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST