16-Year-Old Researcher Discovers Authentication Bypass in Microsoft Titan Analytics Platform
A 16-year-old security researcher operating under the pseudonym Faav uncovered a serious authentication vulnerability in Microsoft Titan, the company's internal analytics platform used for large-scale data analysis.
The flaw stemmed from improper validation of JSON Web Token signatures. Titan checked tenant identifiers, application details, and usernames supplied in tokens but never verified their cryptographic signatures. As a result, an attacker could craft a valid-looking token that mapped the username "admin" to a local administrator account without any credentials or prior account compromise.
Once authenticated as an administrator, the researcher gained the ability to run arbitrary SQL queries against connected data sources. During testing, Faav discovered 17 ClickHouse databases containing metadata for almost 10,000 unique tables. The combined storage was estimated at 17.3 trillion rows, although this figure includes duplicates, historical snapshots, and derived datasets rather than unique user records.
The researcher observed metadata and tens of thousands of records related to employee accounts, addresses, and organizations. Two limited queries against Bing analytics returned single rows each. Faav stated that no customer personal data was examined in bulk and no mass exfiltration occurred.
Faav responsibly disclosed the issue to Microsoft on September 5. The company disabled public access to the affected API on September 9 and paid the researcher a $5,000 bounty on September 17. There is currently no evidence that threat actors exploited the vulnerability prior to its remediation.
Related articles
Security Week 2644: Active Exploitation of PHP2Shell Vulnerabilities Confirmed
PHP developers released patches for two critical vulnerabilities collectively known as PHP2Shell on October 20, affecting PHP 8.2 through 8.5 as well as older branches. The flaws allow unauthenticated remote code execution on affected servers, which power approximately 70 percent of websites. Despite expectations of immediate exploitation, confirmed attacks with working exploits only began on October 25. CrowdStrike noted technical difficulties in weaponizing the issues in real-world environments. Only one-fifth of top Russian websites had applied the fixes by October 25. Additional incidents included compromised eMudhra certificates, a critical GitLab flaw, and a 16-year-old Broadcom router vulnerability.
Positive Technologies Offers Up to 500,000 Rubles for Bypassing PT Application Firewall
Positive Technologies has expanded its Standoff Bug Bounty program to include rewards for bypassing its web application firewalls. Researchers can earn between 150,000 and 500,000 rubles for demonstrating practical bypasses against PT Application Firewall PRO and PT Application Firewall Cloud. The program targets the core protective mechanisms, including traffic filtering, attack detection rules, and the management layer used by administrators. Submissions must include reproducible attack scenarios that show how malicious requests can pass through undetected, rather than relying on scanner reports or theoretical findings. Reward amounts vary by severity and confirmed business impact, with critical issues in the PRO version paying up to 500,000 rubles. The company plans to use validated findings to strengthen detection rules and improve overall product resilience.
Tailscale SSH Vulnerability Allows Root Access via Unix Socket Redirection
A researcher identified flaws in Tailscale that let an attacker with existing SSH access on one node escalate to root privileges and move laterally across the network. Erica Windisch of Cyberdione Labs demonstrated the issues in lab conditions against Tailscale 1.104.2 and Headscale 0.29.5. The core problem stems from privileged operations performed by the tailscaled process when handling Unix socket redirection, granting an ordinary SSH session access to root-only resources. The researcher used the technique to interact with Docker and run elevated commands, and showed that broad access policies allow automated lateral movement in under a second. Additional issues include denial-of-service conditions and bypasses of certain restrictions. Recommendations include reviewing SSH policies and disabling unnecessary socket redirection, noting that Headscale 0.29.5 lacks an independent way to turn the feature off.
Critical CVE-2026-111497 Out-of-Bounds Write Flaw in Google Brotli Decoder Impacts Broad Range of Environments
A severe vulnerability has been identified in the Google-developed Brotli decoder used for decompressing data in web communications and other applications. The flaw, tracked as CVE-2026-111497, allows out-of-bounds writes when processing specially crafted compressed data, potentially enabling arbitrary code execution, information disclosure, or denial of service. It carries a CVSS v4.0 base score of 9.2 and is rated Critical. Google has released patched versions 1.2.1, 1.1.1, and 1.0.10 of the library. Node.js incorporated the fix in its updates, while Microsoft issued an out-of-band patch for .NET on October 25, 2026, to address the issue. The vulnerability affects any environment relying on the Brotli C implementation for data decompression.