CVE-2021-43808

MEDIUM
Published Dec 8, 20214y ago · Modified Jun 17, 20262w ago
6.1 CVSS 3.1
Medium
Find Similar
Published Dec 8, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
6.1
Exploitability
2.8
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-327
CWE-79 Cross-site Scripting Injection

Affected Products 3

VendorProductVersionRange
laravelframework* <6.20.42
laravelframework*≥7.0.0  –  <7.30.6
laravelframework*≥8.0.0  –  <8.75.0

References 8

  • github.com https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b
    PatchThird Party Advisory
  • github.com https://github.com/laravel/framework/pull/39906
    PatchThird Party Advisory
  • github.com https://github.com/laravel/framework/pull/39908
    PatchThird Party Advisory
  • github.com https://github.com/laravel/framework/pull/39909
    PatchThird Party Advisory
  • github.com https://github.com/laravel/framework/releases/tag/v6.20.42
    Release NotesThird Party Advisory
  • github.com https://github.com/laravel/framework/releases/tag/v7.30.6
    Release NotesThird Party Advisory
  • github.com https://github.com/laravel/framework/releases/tag/v8.75.0
    Release NotesThird Party Advisory
  • github.com https://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfw
    ExploitThird Party Advisory

Remediation

  • github.com https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b
    PatchThird Party Advisory
  • github.com https://github.com/laravel/framework/pull/39906
    PatchThird Party Advisory
  • github.com https://github.com/laravel/framework/pull/39908
    PatchThird Party Advisory
  • github.com https://github.com/laravel/framework/pull/39909
    PatchThird Party Advisory