Vulnerability CVE-2020-7776
Published: 2020-12-09

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.

Type:

CWE-79

 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))

CVSS2 => (AV:N/AC:M/Au:S/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
3.5/10
2.9/10
6.8/10
Exploit range
Attack complexity
Authentication
Remote
Medium
Single time
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Phpspreadsheet project -> Phpspreadsheet 

 References:
https://github.com/PHPOffice/PhpSpreadsheet/blob/master/src/PhpSpreadsheet/Writer/Html.php%23L1792
https://github.com/PHPOffice/PhpSpreadsheet/commit/0ed5b800be2136bcb8fa9c1bdf59abc957a98845
https://snyk.io/vuln/SNYK-PHP-PHPOFFICEPHPSPREADSHEET-1048856
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