XSS in Sensiolabs Symfony
CVE-2026-45072
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.4.24 until 6.4.40, 7.4.12, and 8.0.12, the development profiler file_excerpt Twig filter escapes PHP files through highlight_string() but interpolates lines from non-PHP files directly into <code> elements, allowing stored XSS against a developer who opens an attacker-written file such as var/log/dev.log in the profiler. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Sensiolabs Symfony
- Symfony — versions >= 6.4.24, < 6.4.40, >= 7.2.9, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
- Symfony Twig-Bridge — versions >= 6.4.24, < 6.4.40
- Symfony Web-Profiler-Bundle — versions >= 7.2.9, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
Weakness classification (CWE)
References
- github.com/symfony/symfony/security/advisories/GHSA-hmr5-2xcr-v8pp (Patch, Vendor Advisory)
- github.com/symfony/symfony/commit/863aa81c61166f1aa74b7732df316f76113acbdb (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-2026-45072?
- CVE-2026-45072 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-14.
- How severe is CVE-2026-45072?
- Medium severity. CVSS v3 base score is 5.4 out of 10.