cure53 DOMPurify up to 3.3.x permissive list of allowed inputs

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in cure53 DOMPurify up to 3.3.x. This vulnerability affects unknown code. The manipulation leads to permissive list of allowed inputs. This vulnerability is listed as CVE-2026-41240. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in cure53 DOMPurify up to 3.3.x. It has been rated as problematic. This issue affects an unknown code. The manipulation with an unknown input leads to a permissive list of allowed inputs vulnerability. Using CWE to declare the problem leads to CWE-183. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are explicitly allowed by policy because the inputs are assumed to be safe, but the list is too permissive - that is, it allows an input that is unsafe, leading to resultant weaknesses. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-41240 since 04/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 310044 (Linux Distros Unpatched Vulnerability : CVE-2026-41240), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.4.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (310044) and CERT Bund (WID-SEC-2026-1407). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • IBM App Connect Enterprise
  • Red Hat Enterprise Linux
  • Fedora Linux
  • IBM QRadar SIEM
  • IBM MQ
  • IBM Maximo Asset Management
  • IBM Sterling Connect:Direct

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Permissive list of allowed inputs
CWE: CWE-183 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 310044
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-41240

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: DOMPurify 3.4.0

Timelineinfo

04/18/2026 CVE reserved
04/23/2026 +5 days Advisory disclosed
04/23/2026 +0 days VulDB entry created
06/20/2026 +57 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-41240 (🔒)
GCVE (CVE): GCVE-0-2026-41240
GCVE (VulDB): GCVE-100-359153
CERT Bund: WID-SEC-2026-1407 - IBM App Connect Enterprise Certified Container: Mehrere Schwachstellen

Entryinfo

Created: 04/23/2026 18:15
Updated: 06/20/2026 01:33
Changes: 04/23/2026 18:15 (65), 04/24/2026 08:14 (2), 05/08/2026 01:39 (7), 06/20/2026 01:33 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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