

Apache Syncope Flaw Exposes Internal Database Data
November 26, 2025
Patchwork APT Group – Active IOCs
November 27, 2025
Apache Syncope Flaw Exposes Internal Database Data
November 26, 2025
Patchwork APT Group – Active IOCs
November 27, 2025Severity
High
Analysis Summary
A newly disclosed critical vulnerability in Azure Bastion, tracked as CVE-2025-49752, allows remote attackers to completely bypass authentication and elevate privileges to full administrative access. The flaw, rated CVSS high, impacts all Azure Bastion deployments prior to November 20, 2025, making it one of the most severe security risks affecting Azure this year. Categorized as an Authentication Bypass (CWE-294) issue, this vulnerability directly undermines the core purpose of Azure Bastion secure, identity-based remote access to cloud infrastructure.
The root of the flaw, according to Zeropath, lies in improper handling and validation of authentication tokens inside the Bastion service. Attackers can intercept valid credentials and replay them to bypass security controls entirely. Exploitation requires no user interaction, no prior privileges, and is executed through a single network request, making it trivial for an attacker on the network to gain administrative control. The impact extends beyond Bastion itself, allowing adversaries to compromise all virtual machines connected through the service.
Because the attack is fully network-exploitable, Azure customers face immediate exposure if the Bastion instance has not been updated. Microsoft has not specified version numbers, indicating that all configurations of the service were vulnerable until the November 20, 2025 security fix. The flaw joins other major Azure authentication-related issues reported this year, including CVE-2025-54914 and CVE-2025-29827, raising concerns about recurring weaknesses despite Microsoft’s ongoing Secure Future Initiative.
Security teams are strongly advised to apply the latest patches, verify Bastion configuration integrity, and conduct a full review of administrative access logs to detect suspicious activity. Organizations should also reassess network segmentation, access control boundaries, and isolation around Bastion deployments to reduce lateral movement opportunities. With its potential to compromise critical cloud workloads, CVE-2025-49752 demands urgent remediation and strategic tightening of Azure identity and access management practices.
Impact
- Privilege Escalation
- Gain Access
Indicators of Compromise
CVE
CVE-2025-54914
CVE-2025-29827
CVE-2025-49752
Affected Vendors
Remediation
- Immediately apply the Azure Bastion security update released on November 20, 2025 to eliminate the authentication bypass vulnerability.
- Audit all administrative access logs for any unusual or unauthorized login attempts, token replays, or unexpected privilege escalations.
- Rotate all Bastion-related credentials, keys, and tokens, especially if suspicious activity is detected or logs are incomplete.
- Review and harden network segmentation, ensuring Bastion is isolated from sensitive workloads and accessible only from trusted network zones.
- Enable conditional access policies and enforce strict MFA requirements to reduce the risk of token replay or weak identity controls.
- Restrict Bastion access using network security groups (NSGs), firewalls, and IP allowlists to minimize exposure to untrusted sources.
- Implement continuous monitoring and alerting for Bastion-related authentication events via Azure Monitor, Sentinel, or third-party SIEM tools.
- Validate all Azure Bastion configuration settings to ensure no misconfigurations exist post-patch, especially around identity provider integrations.
- Review RBAC permissions and remove unnecessary administrative privileges or overly broad roles tied to Bastion access.
- Conduct a full security assessment of Azure cloud infrastructure to check for lateral movement or VM compromise stemming from this vulnerability.
- Update incident response playbooks to include detection and recovery steps specifically for Azure token replay or authentication bypass scenarios.








