What is the CVSS score of CVE-2026-1553?

CVE-2026-1553 has a CVSS 3.1 base score of 4.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-1553?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Drupal Canvas CVE-2026-1553

MEDIUM

Incorrect Authorization (CWE-863)

2026-02-04 mlhess@drupal.org

Drupal Drupal Canvas

4.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-863 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Authorization logic validation MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 4.8 (MEDIUM). Attack vector: Network. Complexity: High. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Improper authorization controls in Drupal Canvas versions before 1.0.4 enable attackers to bypass access restrictions and enumerate or access restricted resources through direct browsing. The vulnerability requires specific conditions to exploit (high attack complexity) but affects all unauthenticated users with network access. Currently, no patch is publicly available and exploitation activity has not been confirmed.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 4.8

Incorrect Authorization vulnerability in Drupal Drupal Canvas allows Forceful Browsing.This issue affects Drupal Canvas: from 0.0.0 before 1.0.4. [CVSS 4.8 MEDIUM]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affected Packages

composer drupal/canvas fix: 1.0.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in composer

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-863 (Incorrect Authorization). Affects Drupal Canvas. Incorrect Authorization vulnerability in Drupal Drupal Canvas allows Forceful Browsing.This issue affects Drupal Canvas: from 0.0.0 before 1.0.4.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 4.8 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Feb 04, 2026 - 21:15 nvd

MEDIUM 4.8

DescriptionCVE.org

Incorrect Authorization vulnerability in Drupal Drupal Canvas allows Forceful Browsing.This issue affects Drupal Canvas: from 0.0.0 before 1.0.4.

Executive ViewAI

Why It Matters

Organizations using Incorrect Authorization vulnerability in Drupal Drupal Canvas should be aware of moderate risk from CVE-2026-1553, a incorrect authorization vulnerability rated CVSS 4.8. Attackers could gain access beyond their authorized level. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.0%

Top 88% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.