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Not in CISA KEV
HIGH severity

Browsershot Improper Input Validation vulnerabilityGHSA-c9f5-29f6-c35w

HIGHFix: spatie/browsershot@f791ce0

GHSA-c9f5-29f6-c35w is a high-severity (CVSS 8.6) Improper Input Validation vulnerability in spatie/browsershot. A fix is available for spatie/browsershot — see the affected versions and patch details below.

Also known asCVE-2024-21549
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA’s SSVC triage for GHSA-c9f5-29f6-c35w.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs49th percentile — riskier than 49% of all scored CVEsHighest risk
0.00%0.37%0.74%1.11%0.0%0.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘spatie/browsershot

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Versions of the package spatie/browsershot before 5.0.3 are vulnerable to Improper Input Validation due to improper URL validation through the setUrl method. An attacker can exploit this vulnerability by utilizing view-source:file://, which allows for arbitrary file reading on a local file.

Note:

This is a bypass of the fix for CVE-2024-21544.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistspatie/browsershotall versions5.0.3composer require spatie/browsershot:^5.0.3

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for spatie/browsershot, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update spatie/browsershot to 5.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c9f5-29f6-c35w is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Versions of the package spatie/browsershot before 5.0.3 are vulnerable to Improper Input Validation due to improper URL validation through the setUrl method. An attacker can exploit this vulnerability by utilizing view-source:file://, which allows for arbitrary file reading on a local file. **Note:** This is a bypass of the fix for [CVE-2024-21544](https://security.snyk.io/vuln/SNYK-PHP-SPATIEBROWSERSHOT-8496745).
O3 Security · Impact-Aware SCA

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Browsershot Improper Input Validation vulnerability