Read the docs
TI-2023-14375 Aliases CVE-2023-30540

Chat poll data can still be queried from API after purging history in Nextcloud talk

Priority LOW 21CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00656 51st percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 15.0.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisories15.0.0 to before 15.0.515.0.5Patch availableCNA
  • security-advisories Vendornextcloud Affected 15.0.0 to before 15.0.5 Fixed in 15.0.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*15.0.0 to before 15.0.5Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:* Versions 15.0.0 to before 15.0.5 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 15.0.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-30540
  2. 2026-10-13 EPSS moved to the 50th–90th percentile

References

Patch 1

Advisory 1

Other 1

  • TI-2022-08697 Open Redirect in Nextcloud Talk CVSS 3.1MEDIUM 6.1
  • TI-2021-18019 Geolocation preview links can be set to arbitrary links in nextcloud talk CVSS 3.1MEDIUM 6.1
  • TI-2023-24170 Password of talk conversations can be bruteforced in Nextcloud CVSS 3.1MEDIUM 4.3
  • TI-2022-08700 Exposure of Private Personal Information to an Unauthorized Actor in Nextcloud Talk CVSS 3.1MEDIUM 4.3
  • TI-2020-06598 Code injection in Nextcloud Talk CVSS 3.1CRITICAL 9.9
  • TI-2023-08722 Passcode bypass on Talk-Android app CVSS 3.1LOW 2.1
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences