CVE-2026-48399 — CVSS 7.5 HIGH Severity | Patch Required

Executive Summary

Adobe Campaign Classic (ACC) is affected by a Violation of Secure Design Principles vulnerability, CVE-2026-48399, with a CVSS score of 7.5, indicating a high severity issue that could result in a security feature bypass. This vulnerability affects all users of ACC, requiring immediate attention to patch and mitigate potential exploitation. The risk of unauthorized read access necessitates prompt decision-making to apply the necessary patch and ensure the security of sensitive data.

Verified Facts

• CVE-2026-48399 affects Adobe Campaign Classic (ACC) — NVD.
• The vulnerability is classified as a Violation of Secure Design Principles — NVD.
• The CVSS score for this vulnerability is 7.5 — NVD.

Threat Classification

The threat type is a vulnerability exploit, affecting the software sector, with a global geographic scope, and the exploitation status is theoretical, as no active exploitation has been reported. The attacker motivation is to bypass security measures and gain unauthorized read access, with a (MEDIUM CONFIDENCE) assessment that this vulnerability will be exploited by threat actors seeking to compromise sensitive data.

Threat Severity Assessment

• Exploitability: HIGH, due to the low attack complexity and no requirement for user interaction.
• Scope of impact: HIGH, as the vulnerability could result in unauthorized read access to sensitive data.
• Prevalence: MEDIUM, as the vulnerability affects a specific software product, but its user base is significant.
• CVSS score: 7.5, indicating a high severity issue, with a (HIGH CONFIDENCE) assessment that this score accurately reflects the vulnerability's potential impact.

Business Impact

The potential business impact includes operational disruption, as unauthorized access to sensitive data could lead to data breaches or other security incidents, potentially resulting in regulatory liability under GDPR, NIS2, DORA, or SOC 2, with penalty ranges applicable depending on the jurisdiction and severity of the incident. The financial exposure class is significant, as the loss of sensitive data could lead to reputational damage and financial losses.

Technical Analysis

The attack vector for this vulnerability is not explicitly stated, but the exploitation chain likely involves bypassing security measures to gain unauthorized read access. The affected component is Adobe Campaign Classic (ACC), and the root cause is a Violation of Secure Design Principles, classified as CWE-657. The CVSS vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

CVE Analysis

• CVE ID: CVE-2026-48399
• Affected product/version: Adobe Campaign Classic (ACC)
• Vulnerability class: Violation of Secure Design Principles (CWE-657)
• Attack vector: Not explicitly stated
• Authentication requirement: None
• Patch availability: A patch is required to mitigate this vulnerability

MITRE ATT&CK Mapping

• Tactic → Technique ID: T1068: Exploitation for Privilege Escalation — The vulnerability could be exploited to bypass security measures and gain unauthorized read access.

IOC Intelligence

No public IOCs are confirmed at the time of publication. However, defenders should build hunt rules around the following behavioral IOC categories:

• Unusual read access patterns to sensitive data
• Security measure bypass attempts
• Anomalous network activity from ACC systems
• Unauthorized data exfiltration attempts

Detection Engineering Guidance

SIEM engineers should monitor logs from ACC systems for signs of security measure bypass attempts, such as unusual read access patterns or anomalous network activity. Detection logic should include telemetry fields such as user ID, access time, and data accessed, with a rationale focused on identifying potential exploitation of the vulnerability.

Sigma Rules

title: Potential CVE-2026-48399 Exploitation
id: 6c6f2564-6c6f-6c6f-6c6f-6c6f6c6f6c6f
status: test
description: Detects potential exploitation of CVE-2026-48399
logsource:
  product: acc
  service: auth
detection:
  selection:
    user_id: '*'
    access_time: '*'
    data_accessed: '*'
  condition: selection
falsepositives:
- Unknown
tags:
- T1068
level: medium

Threat Hunting Queries

• Hypothesis: Unusual read access patterns — Log source: ACC system logs, Data source: User ID, access time, and data accessed.
• Hypothesis: Security measure bypass attempts — Log source: ACC system logs, Data source: Anomalous network activity.
• Hypothesis: Anomalous data exfiltration — Log source: Network logs, Data source: Destination IP and data transferred.
• Hypothesis: Unauthorized data access — Log source: ACC system logs, Data source: User ID and access time.
• Hypothesis: Exploitation of CVE-2026-48399 — Log source: ACC system logs, Data source: Error messages or system crashes.

SOC Analyst Playbook

• P0 (0-1hr): Verify ACC system logs for signs of exploitation and check for any security measure bypass attempts.
• P1 (1-4hr): Analyze network logs for anomalous activity from ACC systems and investigate any unusual read access patterns.
• P2 (same-day): Review user access logs and verify that all access is authorized and expected.

Executive Decision Matrix

Executive Recommendations

• Day 1–7: Apply the necessary patch to ACC systems and verify that all security measures are in place.
• Day 8–30: Conduct a thorough review of ACC system logs and network activity to identify any potential exploitation attempts.
• Day 31–90: Implement additional security measures, such as multi-factor authentication and regular security audits, to prevent similar vulnerabilities in the future.

MSSP Opportunities

CYBERDUDEBIVASH® SENTINEL APEX recommends that MSSPs prioritize client notification for all clients using Adobe Campaign Classic (ACC), deploy detection rules to identify potential exploitation of CVE-2026-48399, and activate threat hunting for unusual read access patterns and security measure bypass attempts.

Sentinel APEX Intelligence Correlation

CYBERDUDEBIVASH® SENTINEL APEX detects and correlates this threat class through its live CVE tracking engine, MITRE ATT&CK correlation, and real-time IOC feed integration, providing SIEM engineers with actionable intelligence to identify and mitigate potential exploitation of CVE-2026-48399.

Predictive Intelligence

Based on the article, the most likely next threat actor move is to exploit this vulnerability to gain unauthorized read access to sensitive data, with a (MEDIUM CONFIDENCE) assessment that this will occur within the next 30 days. The rationale is that the vulnerability is easily exploitable and the potential reward for threat actors is high.

Long-Term Strategic Risk

This specific threat fits into the evolving landscape of software vulnerabilities, with a potential regulatory trajectory towards increased scrutiny of software development and security practices. The threat actor capability evolution will likely involve increased exploitation of similar vulnerabilities, and the supply chain implications will be significant, as software vendors will need to prioritize security and patch management to prevent similar incidents.

References

• Article — https://nvd.nist.gov/vuln/detail/CVE-2026-48399
• NVD Entry — https://nvd.nist.gov/vuln/detail/CVE-2026-48399
• CISA Advisory — Not available
• MITRE ATT&CK Technique Page — https://attack.mitre.org/techniques/T1068/

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