CVE-2026-70657: CWE-863: Incorrect Authorization in 9001 copyparty
CVE-2026-70657 is an incorrect authorization vulnerability in copyparty, a portable file server. Versions prior to 1.20.17 allow a combination of directory-key and file-key flags to convert a valid file key into a directory key, granting unintended read access to the containing folder. This issue requires manual enabling of both filekeys and dirkeys simultaneously. The vulnerability is fixed in version 1.20.17.
AI Analysis
Technical Summary
In copyparty versions before 1.20.17, when a volume is configured with both the dk or dks directory-key flag and the fk or fka file-key flag, it is possible to convert a valid file key into a directory key. This conversion grants read access to the directory containing the file, which is an incorrect authorization flaw (CWE-863). The vulnerability is conditional on manual enabling of both key types simultaneously. The issue was addressed and fixed in version 1.20.17.
Potential Impact
The vulnerability allows an attacker with access to a valid file key to escalate read permissions to the containing directory, potentially exposing additional files. The impact is limited to confidentiality (read access) with no integrity or availability impact. Exploitation requires low privileges and no user interaction. The CVSS score is 4.3 (medium severity).
Mitigation Recommendations
Upgrade copyparty to version 1.20.17 or later, where this authorization issue is fixed. No other mitigation is required if the fixed version is deployed.
CVE-2026-70657: CWE-863: Incorrect Authorization in 9001 copyparty
Description
CVE-2026-70657 is an incorrect authorization vulnerability in copyparty, a portable file server. Versions prior to 1.20.17 allow a combination of directory-key and file-key flags to convert a valid file key into a directory key, granting unintended read access to the containing folder. This issue requires manual enabling of both filekeys and dirkeys simultaneously. The vulnerability is fixed in version 1.20.17.
CVSS v3.1
Score 4.3medium
Affected software
9001
copyparty
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In copyparty versions before 1.20.17, when a volume is configured with both the dk or dks directory-key flag and the fk or fka file-key flag, it is possible to convert a valid file key into a directory key. This conversion grants read access to the directory containing the file, which is an incorrect authorization flaw (CWE-863). The vulnerability is conditional on manual enabling of both key types simultaneously. The issue was addressed and fixed in version 1.20.17.
Potential Impact
The vulnerability allows an attacker with access to a valid file key to escalate read permissions to the containing directory, potentially exposing additional files. The impact is limited to confidentiality (read access) with no integrity or availability impact. Exploitation requires low privileges and no user interaction. The CVSS score is 4.3 (medium severity).
Mitigation Recommendations
Upgrade copyparty to version 1.20.17 or later, where this authorization issue is fixed. No other mitigation is required if the fixed version is deployed.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-04T21:48:08.612Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8474a0c6e8be03325e7d5b
Added to database: 08/18/2026, 15:05:04 UTC
Last enriched: 09/11/2026, 21:33:32 UTC
Last updated: 10/02/2026, 02:46:06 UTC
Views: 65
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