Auth bypass in Sensiolabs Symfony
CVE-2026-45754
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 6.4.40, 7.4.12, and 8.0.12, the Mailjet mailer bridge and LOX24 notifier bridge webhook parsers received configured webhook secrets but did not verify them, allowing unauthenticated POST requests to inject forged Mailjet and LOX24 event payloads. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Sensiolabs Symfony
- Symfony Lox24-Notifier — versions >= 7.1.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
- Symfony Mailjet-Mailer — versions >= 6.4.0, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
- Symfony — versions >= 6.4.0, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
Weakness classification (CWE)
References
- github.com/symfony/symfony/security/advisories/GHSA-64hg-93w9-fc35 (Patch, Vendor Advisory)
- github.com/symfony/symfony/commit/3e52bf5ab733ee32e35eeeeb2631d859c941838e (Patch)
- github.com/symfony/symfony/commit/4aaa45dd054f73445f1ab254968b7e60b546cc77 (Patch)
- github.com/symfony/symfony/releases/tag/v6.4.40 (Release Notes)
- github.com/symfony/symfony/releases/tag/v7.4.12 (Release Notes)
- github.com/symfony/symfony/releases/tag/v8.0.12 (Release Notes)
Frequently asked questions
- What is CVE-2026-45754?
- CVE-2026-45754 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-07-14.
- How severe is CVE-2026-45754?
- Medium severity. CVSS v3 base score is 5.3 out of 10.