Unauthenticated Path Traversal in Paisa File Handlers

Paisa before 0.7.8 contains a path traversal vulnerability in the GetFile, GetSheet, DeleteBackups, and DeleteSheetBackups handlers that lets unauthenticated attackers read files and delete backups through ../ sequences in file names. Attackers can send crafted names to the editor file and delete_backups endpoints to read any server-readable file and remove backup files outside the journal or sheets directory.

Casky was already ahead

This CVE exploits attack patterns that Casky's 351matched 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

Paisa versions before 0.7.8 contain a critical path traversal vulnerability (CWE-22) affecting multiple file handling endpoints including GetFile, GetSheet, DeleteBackups, and DeleteSheetura handlers. This vulnerability allows unauthenticated attackers to exploit directory traversal sequences (../) to read arbitrary files accessible to the server process and delete backup files outside intended directories. The vulnerability is particularly severe because it requires no authentication, affects core file operations, and can result in unauthorized information disclosure and data destruction—creating risk for any organization running vulnerable Paisa instances.

Casky's 351 mapped skills enable detection of the reconnaissance and impact patterns underlying this CVE through MITRE ATT&CK techniques TA0001 (Reconnaissance) and TA0007 (Discovery). Practitioners using Casky will identify suspicious patterns including: malformed file path requests containing multiple ../ sequences sent to editor and delete_backups endpoints, anomalous file access attempts targeting directories outside the application's intended scope, and batch deletion requests against backup locations. Claude's extended reasoning capabilities correlate these indicators across request logs, parameter analysis, and endpoint behavior to surface the characteristic attack signatures—allowing security teams to detect exploitation attempts, validate patch status, and implement compensating controls before attackers establish persistent access or exfiltrate sensitive data.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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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 →

351 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-116067.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0007

Investigate the attack patterns behind CVE-2026-116067

Casky has 351 skills that investigate the attack patterns behind CVE-2026-116067. Run one and get CVSS-scored findings in 3 minutes.

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