Recursive Operations Bypass Path-Based Access Controls

File Browser before v2.63.22 fails to validate access rules for descendants during recursive copy, rename, and delete operations, allowing authenticated users to bypass path-based access controls. Attackers can copy, rename, or delete denied files by operating on their allowed parent directory, defeating rule-based isolation for confidentiality and integrity.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

File Browser versions before v2.63.22 contain a critical access control flaw where recursive copy, rename, and delete operations fail to validate permissions on descendant files and directories. This vulnerability allows authenticated users with access to a parent directory to manipulate files they should not be able to touch by operating at the parent level, effectively circumventing path-based isolation controls. Organizations relying on File Browser for multi-tenant environments or role-based file segregation are at risk of unauthorized data exposure, modification, or deletion—undermining both confidentiality and integrity protections that users believe are in place.

Casky's 283 matching skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&ACK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would identify suspicious patterns such as recursive operations on parent directories followed by unexpected changes to descendant files, lateral access to restricted paths through parent-level manipulation, and audit log anomalies showing permission bypasses during batch file operations. The platform's mapping to 754 security skills enables detection of both the initial access vector (authenticated session) and post-exploitation indicators—including unusual recursive operation sequences, access to files inconsistent with user role assignments, and patterns suggesting systematic directory traversal to reach denied resources. Security teams would see findings flagging recursive operations that cross privilege boundaries and recommendations for validating access controls at each level of directory trees, not just parent directories.

Live Threat IntelligenceComing soon

Casky Risk Score

—

EPSS Probability

—

Shodan Exposure

—

GreyNoise Signal

—

Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-73612.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-73612

Casky has 283 skills that investigate the attack patterns behind CVE-2026-73612. Run one and get CVSS-scored findings in 3 minutes.

Run the skill that detects this →

X Instagram LinkedIn