CVE-2026-70657: CWE-863: Incorrect Authorization in 9001 copyparty
CVE-2026-70657 is an 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 affects volumes with the dk or dks directory-key flag combined with the fk or fka file-key flag, even though these features are disabled by default and must be explicitly enabled. The vulnerability is fixed in version 1.20.17.
AI Analysis
Technical Summary
In copyparty versions before 1.20.17, an incorrect authorization issue (CWE-863) exists where copyparty volumes configured with the dk or dks directory-key flag combined with the fk or fka file-key flag can convert a valid file key into a directory key. This conversion improperly grants read access to the containing folder, bypassing intended access controls. Both directory-key and file-key features are disabled by default and require explicit enabling in volume flags. The vulnerability is resolved in version 1.20.17.
Potential Impact
An attacker with at least low privileges (PR:L) can exploit this vulnerability to gain read access to directories that should be restricted, potentially exposing sensitive files. The impact is limited to confidentiality (C:L) with no integrity or availability effects. The vulnerability can be exploited remotely (AV:N) without user interaction (UI:N).
Mitigation Recommendations
Upgrade copyparty to version 1.20.17 or later, where this authorization issue is fixed. Since the vulnerability requires explicit enabling of certain volume flags, ensure that these flags are not enabled unless necessary. Patch status is confirmed fixed in 1.20.17.
CVE-2026-70657: CWE-863: Incorrect Authorization in 9001 copyparty
Description
CVE-2026-70657 is an 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 affects volumes with the dk or dks directory-key flag combined with the fk or fka file-key flag, even though these features are disabled by default and must be explicitly enabled. The vulnerability is fixed in version 1.20.17.
CVSS v3.1
Score 4.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In copyparty versions before 1.20.17, an incorrect authorization issue (CWE-863) exists where copyparty volumes configured with the dk or dks directory-key flag combined with the fk or fka file-key flag can convert a valid file key into a directory key. This conversion improperly grants read access to the containing folder, bypassing intended access controls. Both directory-key and file-key features are disabled by default and require explicit enabling in volume flags. The vulnerability is resolved in version 1.20.17.
Potential Impact
An attacker with at least low privileges (PR:L) can exploit this vulnerability to gain read access to directories that should be restricted, potentially exposing sensitive files. The impact is limited to confidentiality (C:L) with no integrity or availability effects. The vulnerability can be exploited remotely (AV:N) without user interaction (UI:N).
Mitigation Recommendations
Upgrade copyparty to version 1.20.17 or later, where this authorization issue is fixed. Since the vulnerability requires explicit enabling of certain volume flags, ensure that these flags are not enabled unless necessary. Patch status is confirmed fixed in 1.20.17.
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
- Remediation Level
- null
Threat ID: 6a8474a0c6e8be03325e7d5b
Added to database: 08/18/2026, 15:05:04 UTC
Last enriched: 08/18/2026, 15:20:11 UTC
Last updated: 08/18/2026, 15:36:05 UTC
Views: 5
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