CVE-2020-7776 Cross-site Scripting (XSS)

2020-12-0916:45:18

snyk

www.cve.org

cve-2020-7776

cross-site scripting

phpoffice/phpspreadsheet

xss

html output

excel file

comment

vulnerability fix

CVSS3

7.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N/E:P/RL:O/RC:C

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

26.4%

JSON

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.

CNA Affected

[
  {
    "product": "phpoffice/phpspreadsheet",
    "vendor": "n/a",
    "versions": [
      {
        "lessThan": "unspecified",
        "status": "affected",
        "version": "0.0.0",
        "versionType": "custom"
      }
    ]
  }
]