What’s Vulnerable › Vulnerabilities

CVE-2023-39957: Path traversal allows tricking the Talk Android app into writing files into it's root directory

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-10 · updated 2026-06-17
• Weakness: CWE-22

Description

Nextcloud Talk Android allows users to place video and audio calls through Nextcloud on Android. Prior to version 17.0.0, an unprotected intend allowed malicious third party apps to trick the Talk Android app into writing files outside of its intended cache directory. Nextcloud Talk Android version 17.0.0 has a patch for this issue. No known workarounds are available.

Affected products

• Nextcloud Talk: before 17.0.0; 17.0.0-rc1, 17.0.0-rc2, 17.0.0-rc3 — fixed in 17.0.0

How to fix

Upgrade to a fixed version: Nextcloud Talk 17.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-36f7-93f3-mcfj
• https://github.com/nextcloud/talk-android/pull/3064
• https://hackerone.com/reports/1997029
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-36f7-93f3-mcfj
• https://github.com/nextcloud/talk-android/pull/3064
• https://hackerone.com/reports/1997029

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