Medium severity · published Dec 9, 2020
CVE-2020-7776
This affects the package phpoffice/phpspreadsheet from 0.0.0
6.4
CVSS
1.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PH
Phpspreadsheet · Phpoffice
before 1.16.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7776
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-7776
Broken Link
https://github.com/PHPOffice/PhpSpreadsheet/blob/master/src/PhpSpreadsheet/Writer/Html.php%23L1792
Patch
https://github.com/PHPOffice/PhpSpreadsheet/commit/0ed5b800be2136bcb8fa9c1bdf59abc957a98845
Exploit
https://snyk.io/vuln/SNYK-PHP-PHPOFFICEPHPSPREADSHEET-1048856
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PHPSpreadsheet is a pure PHP library for reading and writing spreadsheet files