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cveMitreCVE-2021-28957
HistoryMar 21, 2021 - 5:15 a.m.

CVE-2021-28957

2021-03-2105:15:13
CWE-79
mitre
web.nvd.nist.gov
363
13
cve-2021-28957
python-lxml
xss vulnerability
remote code execution
security patch

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

AI Score

6.5

Confidence

High

EPSS

0.002

Percentile

61.6%

JSON

An XSS vulnerability was discovered in python-lxml’s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

Affected configurations

Nvd
Node
lxmllxmlRange<4.6.3
Node
debiandebian_linuxMatch9.0
OR
debiandebian_linuxMatch10.0
Node
fedoraprojectfedoraMatch33
OR
fedoraprojectfedoraMatch34
Node
netappsnapcenterMatch-
Node
oraclezfs_storage_appliance_kitMatch8.8

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fedora 2
nvd 1
suse 2
photon 4
gentoo 1
oraclelinux 4
ibm 2
oracle 1
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CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

AI Score

6.5

Confidence

High

EPSS

0.002

Percentile

61.6%

JSON
Related for CVE-2021-28957
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