What’s Vulnerable › Vulnerabilities

CVE-2026-48976: HomeBox: Cross-Tenant IDOR in Notifier Update Leaks Shoutrrr Credentials and Allows Webhook Hijack

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-23
• Weakness: CWE-522

Description

HomeBox is a home inventory and organization system. Prior to 0.26.0, NotifierRepository.Update in backend/internal/data/repo/repo_notifier.go updates a notifier through UpdateOneID(id) without requiring the record's user ID to match the authenticated user. An authenticated user who supplies another tenant's notifier UUID to PUT /v1/notifiers/{id} can read the returned stored url, which may contain plaintext Shoutrrr credentials for Slack, SMTP, Telegram, Pushover, or Discord, and can replace the URL to redirect the victim's notifications to an attacker-controlled webhook. This issue is fixed in version 0.26.0.

Affected products

• sysadminsmedia homebox: before 0.26.0

References

• https://github.com/sysadminsmedia/homebox/commit/ed3216a80998dfd81d4418700696244144883160
• https://github.com/sysadminsmedia/homebox/releases/tag/v0.26.0
• https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-mc8h-5c5v-37p7

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