cure53 DOMPurify up to 2.5.8/3.3.1 cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in cure53 DOMPurify up to 2.5.8/3.3.1. It has been rated as problematic. This vulnerability affects unknown code. The manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-0540. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in cure53 DOMPurify up to 2.5.8/3.3.1 and classified as problematic. This issue affects an unknown function. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

DOMPurify 3.1.3 through 3.3.1 and 2.5.3 through 2.5.8, fixed in commit 2726c74, contain a cross-site scripting vulnerability that allows attackers to bypass attribute sanitization by exploiting five missing rawtext elements (noscript, xmp, noembed, noframes, iframe) in the SAFE_FOR_XML regex. Attackers can include payloads like </noscript><img src=x onerror=alert(1)> in attribute values to execute JavaScript when sanitized output is placed inside these unprotected rawtext contexts.

The weakness was presented by Scott Moore. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-0540 since 12/27/2025. 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. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 300629 (Linux Distros Unpatched Vulnerability : CVE-2026-0540), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability. Applying the patch fca0a938b4261ddc9c0293a289935a9029c049f5 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (300629) and CERT Bund (WID-SEC-2026-1007). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • IBM App Connect Enterprise

Productinfo

Vendor

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Version

License

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: 5.2
VulDB Meta Temp Score: 5.1

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

CNA Base Score: 6.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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: 300629
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-0540

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Patch: fca0a938b4261ddc9c0293a289935a9029c049f5

Timelineinfo

12/27/2025 CVE reserved
03/03/2026 +66 days Advisory disclosed
03/03/2026 +0 days VulDB entry created
04/08/2026 +36 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Researcher: Scott Moore
Status: Confirmed

CVE: CVE-2026-0540 (🔒)
GCVE (CVE): GCVE-0-2026-0540
GCVE (VulDB): GCVE-100-348593
CERT Bund: WID-SEC-2026-1007 - IBM App Connect Enterprise: Mehrere Schwachstellen

Entryinfo

Created: 03/03/2026 20:13
Updated: 04/08/2026 14:39
Changes: 03/03/2026 20:13 (77), 03/04/2026 21:47 (1), 03/05/2026 12:10 (2), 03/25/2026 16:42 (2), 03/26/2026 04:10 (2), 04/08/2026 14:39 (7)
Complete: 🔍
Cache ID: 216::103

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

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