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MEDIUM severity

CVE-2023-46735 — webhook

MEDIUMFix: symfony/symfony@8128c30

CVE-2023-46735 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in symfony/webhook. A fix is available for symfony/webhook — see the affected versions and patch details below.

Symfony potential Cross-site Scripting in WebhookController

Also known asBIT-symfony-2023-46735GHSA-72x2-5c85-6wmr
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-46735.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs47th percentile — riskier than 47% of all scored CVEsHighest risk
0.00%1.20%2.41%3.61%2.9%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

2 pkgs affected
🐘symfony/webhook🐘symfony/symfony

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

Description

The error message in WebhookController returns unescaped user-submitted input.

Resolution

WebhookController now doesn't return any user-submitted input in its response.

The patch for this issue is available here for branch 6.3.

Credits

We would like to thank Maxime Aknin for reporting the issue and to Nicolas Grekas for providing the fix.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsymfony/webhook≥ 6.3.0&&< 6.3.86.3.8composer require symfony/webhook:^6.3.8
🐘Packagistsymfony/symfony≥ 6.3.0&&< 6.3.86.3.8composer require symfony/symfony:^6.3.8

Affected Products

1 product · 1 configurations
Application
symfonysensiolabs
≥ 6.0.0 && < 6.3.8
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update symfony/webhook to 6.3.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-46735 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Description The error message in WebhookController returns unescaped user-submitted input. ### Resolution WebhookController now doesn't return any user-submitted input in its response. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/8128c302430394f639e818a7103b3f6815d8d962) for branch 6.3. ### Credits We would like to thank Maxime Aknin for reporting the issue and to Nicolas Grekas for providing the fix.
O3 Security · Impact-Aware SCA

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CVE-2023-46735: webhook — Fixed in 6.3.8