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cve[email protected]CVE-2021-28957
HistoryMar 21, 2021 - 5:15 a.m.

CVE-2021-28957

2021-03-2105:15:13
CWE-79
[email protected]
web.nvd.nist.gov
352
13
cve-2021-28957
python-lxml
xss vulnerability
remote code execution
security patch

4.3 Medium

CVSS2

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

6.1 Medium

CVSS3

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

6.5 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

61.7%

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
CPENameOperatorVersion
lxml:lxmllxmllt4.6.3

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4.3 Medium

CVSS2

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

6.1 Medium

CVSS3

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

6.5 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

61.7%

JSON
Related for CVE-2021-28957
nessus45ubuntucve1rocky4alpinelinux1prion1osv15openvas23github1debian3almalinux4mageia1cbl_mariner2cvelist1redhat6ubuntu2redhatcve1debiancve1veracode1fedora2nvd1suse2photon4gentoo1oraclelinux4ibm2oracle1