Stored XSS via inline attachment rendering
Published Mar 3, 2026 · Updated Mar 3, 2026
Stored XSS in HomeBox before 0.24.0-rc.1 allows remote authenticated users to execute JavaScript through item attachments. The attachment download handler serves attacker-controlled HTML or SVG inline under the application origin without restricting executable MIME types or applying script-blocking response headers. Exploitation requires an authenticated upload and another user to open its direct link, enabling script-driven actions and data access within that user's session.
Summary
What happened
Stored XSS in HomeBox before 0.24.0-rc.1 allows remote authenticated users to execute JavaScript through item attachments. The attachment download handler serves attacker-controlled HTML or SVG inline under the application origin without restricting executable MIME types or applying script-blocking response headers. Exploitation requires an authenticated upload and another user to open its direct link, enabling script-driven actions and data access within that user's session.
The record
- CVE
- CVE-2026-26272
- Published
- Mar 3, 2026
- Updated
- Mar 3, 2026
- Vendor
- SysAdmins Media
- Product
- HomeBox
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 3, 2026CVE publishedPublication date reported by the CVE source.
- Mar 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.24.0-rc.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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