Detections
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SCA: security update for OWASP.AntiSamy (GHSA-8x6f-956f-q43w)
medium Tenable Self-Hosted Container Security Plugin ID 412923
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- OWASP AntiSamy .NET is a library for performing cleansing of HTML coming from untrusted sources. Prior to
version 1.2.0, there is a potential for a mutation cross-site scripting (mXSS) vulnerability in AntiSamy
caused by flawed parsing of the HTML being sanitized. To be subject to this vulnerability the
`preserveComments` directive must be enabled in your policy file and also allow for certain tags at the
same time. As a result, certain crafty inputs can result in elements in comment tags being interpreted as
executable when using AntiSamy's sanitized output. This is patched in OWASP AntiSamy .NET 1.2.0 and later.
See important remediation details in the reference given below. As a workaround, manually edit the
AntiSamy policy file (e.g., antisamy.xml) by deleting the `preserveComments` directive or setting its
value to `false`, if present. Also it would be useful to make AntiSamy remove the `noscript` tag by adding
a line described in the GitHub Security Advisory to the tag definitions under the `<tagrules>` node, or
deleting it entirely if present. As the previously mentioned policy settings are preconditions for the
mXSS attack to work, changing them as recommended should be sufficient to protect you against this
vulnerability when using a vulnerable version of this library. However, the existing bug would still be
present in AntiSamy or its parser dependency (HtmlAgilityPack). The safety of this workaround relies on
configurations that may change in the future and don't address the root cause of the vulnerability. As
such, it is strongly recommended to upgrade to a fixed version of AntiSamy. (CVE-2023-51652)
See Also
Plugin Details
Severity: Medium
ID: 412923
Version: Revision 1.6
Type: Local
Family: SCA Checks
Published: 1/23/2025
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Low
Score: 2.3
Percentile: 9.14
Vendor
Vendor Severity: Medium
CVSS v2
Risk Factor: Medium
Base Score: 6.4
Temporal Score: 4.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS Score Source: CVE-2023-51652
CVSS v3
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 5.3
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 1/2/2024
Vulnerability Publication Date: 1/2/2024
Reference Information
CVE: CVE-2023-51652
cwe: CWE-79