What is CVE-2023-46735?

CVE-2023-46735 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-11-10.

How severe is CVE-2023-46735?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Sensiolabs Symfony

CVE-2023-46735

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Starting in version 6.0.0 and prior to version 6.3.8, the error message in `WebhookController` returns unescaped user-submitted input. As of version 6.3.8, `WebhookController` now doesn't return any user-submitted input in its response.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-11-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Sensiolabs Symfony
Symfony — versions >= 6.3.0, < 6.3.8

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/symfony/symfony/security/advisories/GHSA-72x2-5c85-6wmr (Patch, Vendor Advisory)
github.com/symfony/symfony/commit/8128c302430394f639e818a7103b3f6815d8d962 (Patch)

Frequently asked questions

What is CVE-2023-46735?: CVE-2023-46735 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-11-10.
How severe is CVE-2023-46735?: Medium severity. CVSS v3 base score is 6.1 out of 10.