What is the CVSS score of CVE-2021-26539?

CVE-2021-26539 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 2.0%.

Is there a public PoC exploit available for CVE-2021-26539?

Yes, a public proof-of-concept exploit is available for CVE-2021-26539. Prioritise patching immediately. EPSS: 2.0%.

Is there a patch available for CVE-2021-26539?

Yes, a patch is available for CVE-2021-26539. Update the affected software to the latest version immediately.

Sanitize Html CVE-2021-26539

MEDIUM

2021-02-08 cve@mitre.org

Authentication Bypass Sanitize Html

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Feb 08, 2021 - 17:15 nvd

MEDIUM 5.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

2 npm packages depend on sanitize-html (2 direct, 0 indirect)

Ecosystem-wide dependent count for version 2.3.1.

DescriptionNVD

AnalysisAI

Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the "allowedIframeHostnames" option. Affected products include: Apostrophecms Sanitize-Html. Version information: before 2.3.1.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.