Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M

CVE-2026-75599HomeBox: Stored XSS via `javascript:` URI in Custom Entity Fields

Medium 5.4

In plain English

A medium-severity cross-site scripting in homebox from sysadminsmedia. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 94.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

HomeBox is a home inventory and organization system. Prior to 0.27.0, the maybeUrl() utility accepts markdown-style links in entity custom-field values without restricting the URL scheme, so an authenticated user can store a javascript: URI that is rendered as a clickable anchor on an item page. When another authenticated user clicks the link, attacker-controlled JavaScript executes in the victim's HomeBox origin, enabling session theft, account takeover, or data exfiltration. This issue is fixed in version 0.27.0.

Affected products (as reported)

Vendor	Product	Versions
sysadminsmedia	homebox	< 0.27.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-h4x5-6587-jpwp x_refsource_CONFIRM
https://github.com/sysadminsmedia/homebox/commit/d76b1c9b94e91cd74e56ef8a129325d70835471f x_refsource_MISC
https://github.com/sysadminsmedia/homebox/releases/tag/v0.27.0 x_refsource_MISC