What’s Vulnerable › Vulnerabilities

CVE-2023-28845: Chat room membership disclosed via autocompletion in Nextcloud talk

• Severity: low (CVSS 3.5 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: 2023-03-31 · updated 2026-06-17
• Weakness: CWE-284

Description

Nextcloud talk is a video & audio conferencing app for Nextcloud. In affected versions the talk app does not properly filter access to a conversations member list. As a result an attacker could use this vulnerability to gain information about the members of a Talk conversation, even if they themselves are not members. It is recommended that the Nextcloud Talk is upgraded to 14.0.9 or 15.0.4. There are no known workarounds for this vulnerability.

Affected products

• Nextcloud Talk: from 14.0.0 before 14.0.9; from 15.0.0 before 15.0.4 — fixed in 14.0.9, 15.0.4

How to fix

Upgrade to a fixed version: Nextcloud Talk 14.0.9, 15.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m6r-479j-4chf
• https://github.com/nextcloud/spreed/pull/8651
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m6r-479j-4chf
• https://github.com/nextcloud/spreed/pull/8651

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