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CVE

CVE-2021-43808

Laravel is a web application framework. Laravel prior to versions 8.75.0, 7.30.6, and 6.20.42 contain a possible cross-s

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.

MEDIUM · CVSS 5.3 EPSS 0.00359
Schedule remediation
  • Public exploit or PoC is available
Sigma rules7 YARA rules0
⬡

Weakness Classification

CWE-327Use of a Broken or Risky Cryptographic Algorithm
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

3
laravel framework< 6.20.42
laravel framework>= 7.0.0 and < 7.30.6
laravel framework>= 8.0.0 and < 8.75.0
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Packagist illuminate/view MEDIUM fixed in 6.20.42
Packagist laravel/framework MEDIUM fixed in 6.20.42
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-66hf-2p6w-jqfwgithub.com
◈

Sigma Hunt Rules

7
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productcriticalAntivirus Exploitation Framework Detection
producthighPotential SpEL Injection In Spring Framework
producthighExploit Framework User Agent
productmediumRuby on Rails Framework Exceptions
productmediumDjango Framework Exceptions
productmediumSpring Framework Exceptions
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Dec 2021 · 12:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9bPatchThird Party Advisory
https://github.com/laravel/framework/pull/39906PatchThird Party Advisory
https://github.com/laravel/framework/pull/39908PatchThird Party Advisory
https://github.com/laravel/framework/pull/39909PatchThird Party Advisory
https://github.com/laravel/framework/releases/tag/v6.20.42Release NotesThird Party Advisory
https://github.com/laravel/framework/releases/tag/v7.30.6Release NotesThird Party Advisory
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