Is this vulnerability remotely exploitable?

Yes. As described, a remote attacker with network access to the Asseco SEE Live 2.0 deployment can attempt to exploit the issue by guessing or computing attachment URLs, even without valid credentials.

What level of access does an attacker need?

Typically, only network-level access to the application's HTTP(S) interface is needed. If URLs are truly computable or predictable, no authentication or special privileges may be required.

What is the safest general fix pattern?

Route all attachment access through a server-side controller that first authenticates the requester, then performs fine-grained authorization to verify that the user is allowed to access that specific attachment, and only then returns the content.

Severity:

CRITICAL RISK

(9.9)

Insecure Access Control (CWE-284) in Asseco SEE Live 2.0 Contact Plan & Messaging Attachments

CVE-2025-66956

Published:

Mar 11, 2026

Status:

Deferred

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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HIGH RISK

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Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Insecure Access Control

CWE:

CWE-284

Impact:

Unauthorized Access and Remote Code/Content Execution via Predictable Attachment URLs

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Vulnerability Type

Category:

Insecure Access Control

CWE:

CWE-284

Impact:

Unauthorized Access and Remote Code/Content Execution via Predictable Attachment URLs

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

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Insecure Access Control (CWE-284) in Asseco SEE Live 2.0 Contact Plan & Messaging Attachments

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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