What’s Vulnerable › Vulnerabilities

CVE-2021-41181: Nextcloud Talk app exposes chat messages on lockscreen

• Severity: low (CVSS 2.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-08 · updated 2026-06-17
• Weakness: CWE-200

Description

Nextcloud talk is a self hosting messaging service. In versions prior to 12.3.0 the Nextcloud Android Talk application did not properly detect the lockscreen state when a call was incoming. If an attacker got physical access to the locked phone, and the victim received a phone call the attacker could gain access to the chat messages and files of the user. It is recommended that the Nextcloud Android Talk App is upgraded to 12.3.0. There are no known workarounds.

Affected products

• Nextcloud Talk: before 12.3.0 — fixed in 12.3.0

How to fix

Upgrade to a fixed version: Nextcloud Talk 12.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-497c-c8hx-6qcf
• https://github.com/nextcloud/talk-android/pull/1585
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-497c-c8hx-6qcf
• https://github.com/nextcloud/talk-android/pull/1585

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