Vulnerability in laravel/framework (CVE-2021-43808)
Summary
Vulnerability in laravel/framework (CVE-2021-43808). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 8.75.0 or later.
Original description
The description as published by the source.
Laravel is a web application framework. Laravel prior to versions 8.75.0, 7.30.6, and 6.20.42 contain a possible cross-site scripting (XSS) vulnerability in the Blade templating engine. A broken HTML element may be clicked and the user taken to another location in their browser due to XSS. This is due to the user being able to guess the parent placeholder SHA-1 hash by trying common names of sections. If the parent template contains an exploitable HTML structure an XSS vulnerability can be exposed. This vulnerability has been patched in versions 8.75.0, 7.30.6, and 6.20.42 by determining the parent placeholder at runtime and using a random hash that is unique to each request.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2021-43808 has been found in laravel/framework.
Risk of unauthorized operations or information disclosure.
What to do: upgrade laravel/framework to 8.75.0 or later.
If unsure, ask your IT team or search "laravel/framework CVE-2021-43808" on the vendor's site.
CVE-2021-43808 (laravel/framework) — CWE-327
Attack vector: remote (network-reachable) / unauthenticated
Patched: 8.75.0 — 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.
A vulnerability (CWE-327) exists in laravel/framework.
Check the vendor advisory for the affected versions of laravel/framework.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 8.75.0.
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 'laravel/framework' . 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 'laravel/framework' . | 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
laravel/framework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 laravel/framework to 8.75.0ステージング環境で 8.75.0 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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2021-43808 php-laravel-framework Fixed in: 6.20.14+dfsg-2+deb11u1
References
- advisory nvd.nist.gov
- advisory github.com
- advisory github.com
- advisory github.com
- package github.com
- patch github.com
- patch github.com
- patch github.com
- patch github.com
- report github.com
- web github.com
- web github.com