CVE-2020-7776

Cross-site Scripting (XSS)

Severity Score

6.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Esto afecta al paquete phpoffice/phpspreadsheet desde la versión 0.0.0. La biblioteca es vulnerable a un ataque de tipo XSS cuando se crea una salida html desde un archivo de Excel al agregar un comentario en cualquier celda. La causa raíz de este problema está dentro del escritor de HTML, donde los comentarios de los usuarios están concatenados como parte del enlace y es devuelto como HTML. Una solución para este problema está disponible en commit 0ed5b800be2136bcb8fa9c1bdf59abc957a98845/master branch.

*Credits: Nikkolai Fernandez

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-01-21 CVE Reserved
2020-12-09 CVE Published
2023-03-08 EPSS Updated
2024-09-16 CVE Updated
2024-09-16 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (3)

URL	Tag	Source
https://github.com/PHPOffice/PhpSpreadsheet/blob/master/src/PhpSpreadsheet/Writer/Html.php%23L1792	Broken Link

URL	Date	SRC
https://snyk.io/vuln/SNYK-PHP-PHPOFFICEPHPSPREADSHEET-1048856	2024-09-16

URL	Date	SRC
https://github.com/PHPOffice/PhpSpreadsheet/commit/0ed5b800be2136bcb8fa9c1bdf59abc957a98845	2021-01-19

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Phpspreadsheet Project Search vendor "Phpspreadsheet Project"		Phpspreadsheet Search vendor "Phpspreadsheet Project" for product "Phpspreadsheet"				< 1.16.0 Search vendor "Phpspreadsheet Project" for product "Phpspreadsheet" and version " < 1.16.0"		-		Affected