What’s Vulnerable › Vulnerabilities

CVE-2023-30540: Chat poll data can still be queried from API after purging history in Nextcloud talk

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-04-17 · updated 2026-06-17
• Weakness: CWE-200

Description

Nextcloud Talk is a chat, video & audio call extension for Nextcloud. In affected versions a user that was added later to a conversation can use this information to get access to data that was deleted before they were added to the conversation. This issue has been patched in version 15.0.5 and it is recommended that users upgrad to 15.0.5. There are no known workarounds for this issue.

Affected products

• Nextcloud Talk: from 15.0.0 before 15.0.5 — fixed in 15.0.5

How to fix

Upgrade to a fixed version: Nextcloud Talk 15.0.5. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-c9hr-cq65-9mjw
• https://github.com/nextcloud/spreed/pull/8985
• https://hackerone.com/reports/1894676
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-c9hr-cq65-9mjw
• https://github.com/nextcloud/spreed/pull/8985
• https://hackerone.com/reports/1894676

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