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GitHub_MCVE-2020-26239

HistoryNov 23, 2020 - 7:15 p.m.

CVE-2020-26239

2020-11-2319:15:11

CWE-79

GitHub_M

web.nvd.nist.gov

scratch

addons

webextension

xss

dom-based

vulnerability

cve-2020-26239

security

CVSS2

3.5

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS3

7.6

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

5.4

Confidence

High

EPSS

0.001

Percentile

31.7%

JSON

Scratch Addons is a WebExtension that supports both Chrome and Firefox. Scratch Addons before version 1.3.2 is vulnerable to DOM-based XSS. If the victim visited a specific website, the More Links addon of the Scratch Addons extension used incorrect regular expression which caused the HTML-escaped values to be unescaped, leading to XSS. Scratch Addons version 1.3.2 fixes the bug. The extension will be automatically updated by the browser. More Links addon can be disabled via the option of the extension.

Affected configurations

Nvd

Vulners

Node

scratchaddonsscratch_addonsRange<1.3.2

VendorProductVersionCPE
scratchaddonsscratch_addons*cpe:2.3:a:scratchaddons:scratch_addons:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
scratchaddons	scratch_addons	*	cpe:2.3:a:scratchaddons:scratch_addons::::::::

CNA Affected

[
  {
    "product": "ScratchAddons",
    "vendor": "ScratchAddons",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.3.2"
      }
    ]
  }
]

References

github.com/ScratchAddons/ScratchAddons/blob/a471893df403f86c9182970678175d4772a0690c/addons/more-links/userscript.js#L15

github.com/ScratchAddons/ScratchAddons/commit/b9a52d6532c8514254c7cc1d8e18710dbedc41ff

github.com/ScratchAddons/ScratchAddons/releases/tag/v1.3.2

github.com/ScratchAddons/ScratchAddons/security/advisories/GHSA-6qfq-px3r-xj4p

CVSS2

3.5

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS3

7.6

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

5.4

Confidence

High

EPSS

0.001

Percentile

31.7%

JSON

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