Cyber Resilience

CVE-2026-48784

Open Redirect in Sensiolabs Symfony ≤ 5.4.53

Open Redirect
Published
14 July 2026
Modified
15 July 2026
Patch / advisory
View advisory
CVSS Score v4 5.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0027 19th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-48784 is a medium-severity Encoding Error (CWE-172) vulnerability in Sensiolabs Symfony. Its CVSS base score is 5.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 19th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

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…

more

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.

CWE(s)
CWE-172CWE-601

Related Threats

MITRE ATT&CK Enterprise Techniques

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1027 Obfuscated Files or Information Stealth
Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit.
attack.mitre.org →
T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1566 Phishing Initial Access
Adversaries may send phishing messages to gain access to victim systems.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-45065Same product: Sensiolabs Symfony
CVE-2024-50345Same product: Sensiolabs Symfony
CVE-2026-48736Same product: Sensiolabs Symfony
CVE-2026-45073Same product: Sensiolabs Symfony
CVE-2026-47767Same product: Sensiolabs Symfony
CVE-2026-45070Same product: Sensiolabs Symfony
CVE-2026-45066Same product: Sensiolabs Symfony
CVE-2026-45071Same product: Sensiolabs Symfony
CVE-2026-45077Same product: Sensiolabs Symfony
CVE-2026-45068Same product: Sensiolabs Symfony

Affected Assets

sensiolabs
symfony
≤ 5.4.53 · 6.0.0 — 6.4.41 · 7.0.0 — 7.4.13

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.7.2

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Input validation directly checks and rejects untrusted redirect targets before they are used in a response.

AC-4 Information Flow Enforcement partial match

Information flow enforcement can restrict redirects to only approved/trusted destinations, stopping untrusted user-supplied URLs from being followed.

SI-15 Information Output Filtering partial match

Output filtering enforces correct encoding or escaping of data leaving the system.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require correct data encoding to avoid injection and corruption flaws.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.28 Secure coding mostly match
degrades

Secure coding explicitly requires correct character encoding and output escaping to avoid CWE-172.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect encoding flaws before deployment.

A.8.23 Web filtering partial match
mitigates

Preventing access to attacker-controlled or malicious sites stops users from being redirected to untrusted locations via open-redirect or phishing links.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle includes input/output validation and encoding practices that reduce encoding errors.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate proper encoding/decoding to prevent data corruption or injection.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture and engineering principles address data handling and transformation correctness.

References