CVE-2026-48784: symfony Open Redirect — Fix

Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, UrlGenerator::doGenerate() used strtr() dot-segment encoding that skipped every other chained ../ or ./ segment, allowing attacker-controlled route parameters to generate URLs that collapse to a different path under RFC 3986 normalization. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.

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CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-172 CWE-172

CWE-601 CWE-601

Affected Products

Vendor	Product	Versions
sensiolabs	symfony	< 5.4.53
sensiolabs	symfony	6.0.0 — 6.4.41
sensiolabs	symfony	7.0.0 — 7.4.13
sensiolabs	symfony	8.0.0 — 8.0.13

References

Advisories & Patches

https://github.com/symfony/symfony/commit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d https://github.com/symfony/symfony/security/advisories/GHSA-h5x3-xfc9-m39h

Other References

https://github.com/symfony/symfony/releases/tag/v5.4.53 https://github.com/symfony/symfony/releases/tag/v6.4.41 https://github.com/symfony/symfony/releases/tag/v7.4.13

Frequently Asked Questions

What is CVE-2026-48784? +

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, UrlGenerator::doGenerate() used strtr() dot-segment encoding that skipped every other chained ../ or ./ segment, allowing attacker-controlled route parameters to generate URLs that collapse to a different path under RFC 3986 normalization. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-48784? +

CVE-2026-48784 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-48784? +

CVE-2026-48784 affects products from sensiolabs, specifically: symfony. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-48784? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-48784