DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3942ab86fd advisory.

    See https://github.com/jupytext/jupytext/blob/main/CHANGELOG.md for changes in versions 1.19.5 and 1.19.6.
    For this update, a patch has been applied that reverses the jupyterlab  jupyter-builder change for     Fedora releases  45, since jupyter-builder is only available in F46 and later.  Many CVEs have been     fixed in this release.


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via
    CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies.
    Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML
    sinks, creating second-order XSS gadgets. (CVE-2026-66010)

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-625cbe86c8 advisory.

    34.0.3 Release

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a1368a72b4 advisory.

    34.0.3 Release

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via     CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies.
    Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML     sinks, creating second-order XSS gadgets. (CVE-2026-66010)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
365513	Fedora 43 : python-jupytext (2026-3942ab86fd)	Nessus	Fedora Local Security Checks	Local	high
472761	Echo: dompurify: security update to 3.4.12	Tenable Cloud Security	Echo Local Security Checks	Local	medium
472761	Echo: dompurify: security update to 3.4.12	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
339195	Fedora 43 : nextcloud (2026-625cbe86c8)	Nessus	Fedora Local Security Checks	Local	medium
339193	Fedora 44 : nextcloud (2026-a1368a72b4)	Nessus	Fedora Local Security Checks	Local	medium
329686	Linux Distros Unpatched Vulnerability : CVE-2026-66010	Nessus	Misc.	Local	medium
445098	SCA: security update for dompurify (GHSA-c2j3-45gr-mqc4)	Tenable Cloud Security	SCA Checks	Local	medium
445098	SCA: security update for dompurify (GHSA-c2j3-45gr-mqc4)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-66010

medium

Tenable Plugins

high

medium

medium

medium

medium

medium

medium

medium