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

Quick assessment

Affected
sysadminsmedia homebox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 8.1 · High EPSS 0.25% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
sysadminsmedia homebox < 0.26.0 affected
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I. Basic Information for CVE-2026-48976

Vulnerability Information

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Vulnerability Title
HomeBox: Cross-Tenant IDOR in Notifier Update Leaks Shoutrrr Credentials and Allows Webhook Hijack
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sysadminsmedia homebox < 0.26.0 -

II. Public POCs for CVE-2026-48976

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III. Intelligence Information for CVE-2026-48976

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Other References for CVE-2026-48976 (2)

Same Patch Batch · sysadminsmedia · 2026-09-21 · 5 CVEs total

CVE-2026-48826 8.1 HIGH HomeBox: Cross-Group Inventory Wipe in Homebox via Global Owner Role and X-Tenant Header S
CVE-2026-48975 8.1 HIGH HomeBox: Cross-Tenant IDOR in MaintenanceEntry Update and Delete Allows Tampering and Dest
CVE-2026-55473 6.0 MEDIUM HomeBox: Notifier SSRF guard misses NAT64 prefixes (64:ff9b::/96, 64:ff9b:1::/48) — generi
CVE-2026-48974 5.4 MEDIUM HomeBox: Forced Group Membership Without Consent in Homebox AddMember Handler

IV. Related Vulnerabilities

Same product: homebox
Same vendor: sysadminsmedia
Same weakness: CWE-522

V. Comments for CVE-2026-48976

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