Vulnerability-Lookup

RHSA-2026:27875

Vulnerability from csaf_redhat - Published: 2026-06-22 12:35 - Updated: 2026-06-28 09:38

Summary

Red Hat Security Advisory: OpenShift Virtualization v4.18 Images

Severity

Moderate

Notes

Topic: Red Hat OpenShift Virtualization release v4.18 is now available with updates to packages and images that fix several bugs and add enhancements.

Details: OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains OpenShift Virtualization v4.18 images.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-41240

A flaw was found in DOMPurify, a DOM-only cross-site scripting sanitizer. A remote attacker could exploit an inconsistency in how forbidden tags and attributes are handled when function-based tag additions are used. This allows malicious HTML, MathML, or SVG elements to bypass sanitization and execute arbitrary code in the user's browser, leading to Cross-Site Scripting (XSS).

8.1 (High)


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

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/kubevirt-console-plugin-rhel9@sha256:0c475ed9990370c63105da63232eab10b2a71209ddf6f0b20224bf39107c425a_arm64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/kubevirt-console-plugin-rhel9@sha256:16142d13b13e745165fac567a8b125e6410a9f51f31d2ebc27e712ad859ecd7c_amd64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/kubevirt-console-plugin-rhel9@sha256:6c499b7d9d5daeddef1bbe0233fdca6ad624a1960f0af376f9fd25de5455c374_s390x	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:27875	self
https://access.redhat.com/security/cve/CVE-2026-41240	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-41240	self
https://bugzilla.redhat.com/show_bug.cgi?id=2461147	external
https://www.cve.org/CVERecord?id=CVE-2026-41240	external
https://nvd.nist.gov/vuln/detail/CVE-2026-41240	external
https://github.com/cure53/DOMPurify/commit/c361ba…	external
https://github.com/cure53/DOMPurify/releases/tag/3.4.0	external
https://github.com/cure53/DOMPurify/security/advi…	external

JSON

To clipboard

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          "text": "A flaw was found in DOMPurify, a DOM-only cross-site scripting sanitizer. A remote attacker could exploit an inconsistency in how forbidden tags and attributes are handled when function-based tag additions are used. This allows malicious HTML, MathML, or SVG elements to bypass sanitization and execute arbitrary code in the user\u0027s browser, leading to Cross-Site Scripting (XSS).",
          "title": "Vulnerability description"
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          "text": "DOMPurify: DOMPurify: Cross-Site Scripting (XSS) via inconsistent tag sanitization",
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            "attackComplexity": "LOW",
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            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
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      "title": "DOMPurify: DOMPurify: Cross-Site Scripting (XSS) via inconsistent tag sanitization"
    }
  ]
}

CVE-2026-41240 (GCVE-0-2026-41240)

Vulnerability from cvelistv5 – Published: 2026-04-23 14:54 – Updated: 2026-04-23 17:21

Title

DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix)

Summary

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123, when EXTRA_ELEMENT_HANDLING.tagCheck returns true, the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-183 - Permissive List of Allowed Inputs
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/cure53/DOMPurify/security/advi…	x_refsource_CONFIRM
https://github.com/cure53/DOMPurify/commit/c361ba…	x_refsource_MISC
https://github.com/cure53/DOMPurify/releases/tag/3.4.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
cure53	DOMPurify	Affected: < 3.4.0

Show details on NVD website

JSON

To clipboard

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        "providerMetadata": {
          "dateUpdated": "2026-04-23T17:21:30.547Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "DOMPurify",
          "vendor": "cure53",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.4.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123, when EXTRA_ELEMENT_HANDLING.tagCheck returns true, the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-183",
              "description": "CWE-183: Permissive List of Allowed Inputs",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-23T14:54:32.426Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m"
        },
        {
          "name": "https://github.com/cure53/DOMPurify/commit/c361baa18dbdcb3344a41110f4c48ad85bf48f80",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cure53/DOMPurify/commit/c361baa18dbdcb3344a41110f4c48ad85bf48f80"
        },
        {
          "name": "https://github.com/cure53/DOMPurify/releases/tag/3.4.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cure53/DOMPurify/releases/tag/3.4.0"
        }
      ],
      "source": {
        "advisory": "GHSA-h7mw-gpvr-xq4m",
        "discovery": "UNKNOWN"
      },
      "title": "DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-41240",
    "datePublished": "2026-04-23T14:54:32.426Z",
    "dateReserved": "2026-04-18T03:47:03.135Z",
    "dateUpdated": "2026-04-23T17:21:30.547Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2026:27875

CVE-2026-41240 (GCVE-0-2026-41240)

Tags

Sightings

Nomenclature