HOMEVULNERABILITIESCVE-2021-43808
MEDIUM

CVE-2021-43808

CWE-79Published: December 8, 2021· Updated: Jun 17, 2026

6.1
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-43808 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeChanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected Vendors & Products

Laravel1 product(s)
framework
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b
PATCHhttps://github.com/laravel/framework/pull/39906
PATCHhttps://github.com/laravel/framework/pull/39908
PATCHhttps://github.com/laravel/framework/pull/39909
PATCHhttps://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b
PATCHhttps://github.com/laravel/framework/pull/39906
PATCHhttps://github.com/laravel/framework/pull/39908
PATCHhttps://github.com/laravel/framework/pull/39909
ADVISORYhttps://github.com/laravel/framework/releases/tag/v6.20.42
ADVISORYhttps://github.com/laravel/framework/releases/tag/v7.30.6
ADVISORYhttps://github.com/laravel/framework/releases/tag/v8.75.0
ADVISORYhttps://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfw
ADVISORYhttps://github.com/laravel/framework/releases/tag/v6.20.42
ADVISORYhttps://github.com/laravel/framework/releases/tag/v7.30.6
ADVISORYhttps://github.com/laravel/framework/releases/tag/v8.75.0
ADVISORYhttps://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfw

All References (16)

→
https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9bPatch · Third Party Advisory
→
https://github.com/laravel/framework/pull/39906Patch · Third Party Advisory
→
https://github.com/laravel/framework/pull/39908Patch · Third Party Advisory
→
https://github.com/laravel/framework/pull/39909Patch · Third Party Advisory
→
https://github.com/laravel/framework/releases/tag/v6.20.42Release Notes · Third Party Advisory
→
https://github.com/laravel/framework/releases/tag/v7.30.6Release Notes · Third Party Advisory
→
https://github.com/laravel/framework/releases/tag/v8.75.0Release Notes · Third Party Advisory
→
https://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfwExploit · Third Party Advisory
→
https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9bPatch · Third Party Advisory
→
https://github.com/laravel/framework/pull/39906Patch · Third Party Advisory
→
https://github.com/laravel/framework/pull/39908Patch · Third Party Advisory
→
https://github.com/laravel/framework/pull/39909Patch · Third Party Advisory
→
https://github.com/laravel/framework/releases/tag/v6.20.42Release Notes · Third Party Advisory
→
https://github.com/laravel/framework/releases/tag/v7.30.6Release Notes · Third Party Advisory
→
https://github.com/laravel/framework/releases/tag/v8.75.0Release Notes · Third Party Advisory

Quick Facts

CVE IDCVE-2021-43808
CVSS Score6.1 / 10
SeverityMEDIUM
WeaknessCWE-79
CISA KEVNo
Affected1 vendor(s)
PublishedDec 8, 2021

Related CVEs (CWE-79)

CVE-2025-49410
10.0
CVE-2011-3046
10.0
CVE-2023-0776
10.0
CVE-2021-32671
10.0
CVE-2024-6886
10.0
CVE-2026-54067
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43808 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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