Quick answers
- Is CVE-2026-48976 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-48976 being exploited in the wild.
- How severe is CVE-2026-48976?
- High severity, with a CVSS score of 8.1, published 21 September 2026.
- Which products and versions are affected?
- Sysadminsmedia HomeBox before 0.26.0.
- Is there a fix for CVE-2026-48976?
- A patch was published on 2026-06-13: Fixed in version 0.26.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-48976 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-48976?
- Check whether you run Sysadminsmedia HomeBox at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The NotifierRepository.Update function in backend/internal/data/repo/repo_notifier.go performs UpdateOneID(id) without validating that the notifier's user ID matches the authenticated user making the request. An authenticated attacker can supply another tenant's notifier UUID to the PUT /v1/notifiers/{id} endpoint to read and modify arbitrary notifier configurations, exposing Shoutrrr credential URLs that may contain plaintext secrets for Slack, SMTP, Telegram, Pushover, or Discord. The fix is available in version 0.26.0.
Affected products
- sysadminsmedia HomeBox before 0.26.0
Timeline
- 2026-09-21: disclosed
- 2026-06-13: patched: Fixed in version 0.26.0