LiveActive security incident?Get immediate response
CVE Record

CVE-2017-16652: An issue was discovered in Symfony 2.7.x before 2.7.38, 2.8.x before 2.8.31, 3.2.x before 3.2.14, and 3.3.x...

An issue was discovered in Symfony 2.7.x before 2.7.38, 2.8.x before 2.8.31, 3.2.x before 3.2.14, and 3.3.x before 3.3.13. DefaultAuthenticationSuccessHandler or DefaultAuthenticationFailureHandler takes the content of the _target_path parameter and generates a redirect response, but no check is performed on the path, which could be an absolute URL to an external domain. This Open redirect vulnerability can be exploited for example to mount effective phishing attacks.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Some Symfony login handlers could redirect users to an attacker-controlled external site after authentication events. That can make phishing more convincing because the link may begin on a legitimate application. The bundle does not show remote code execution, data theft by itself, or confirmed active exploitation.

Executive priority

Treat this as a targeted phishing-enablement issue in legacy Symfony systems, not a system compromise by itself. Prioritize internet-facing login flows and older unsupported application stacks, then upgrade or apply vendor package updates.

Technical view

CVE-2017-16652 is an open redirect in Symfony DefaultAuthenticationSuccessHandler and DefaultAuthenticationFailureHandler. They used the _target_path parameter to build a redirect response without checking whether it was an external absolute URL. Affected branches are 2.7.x, 2.8.x, 3.2.x, and 3.3.x before the listed fixed releases.

Likely exposure

Exposure is most likely in legacy Symfony applications on 2.7.x before 2.7.38, 2.8.x before 2.8.31, 3.2.x before 3.2.14, or 3.3.x before 3.3.13, especially where default authentication success or failure handlers process user-influenced _target_path values.

Exploitation context

The cited CVE description says the issue can support effective phishing attacks. The source bundle does not cite CISA KEV status, public exploitation, exploit maturity, or evidence of attacks in the wild.

Researcher notes

The public bundle provides the affected Symfony branches, fixed version thresholds, vulnerable handler names, parameter name, and phishing impact. It does not include CVSS, CWE mapping, exploit telemetry, or detailed patch behavior, so validation should stay focused on version and redirect behavior.

Mitigation direction

  • Upgrade Symfony to 2.7.38, 2.8.31, 3.2.14, 3.3.13, or later supported versions.
  • For Debian-managed Symfony packages, follow the Debian DLA 1707-1 security update guidance.
  • Review vendor Symfony advisory guidance before adding local redirect handling changes.
  • Avoid trusting externally supplied redirect targets in authentication flows.

Validation and detection

  • Inventory Symfony versions across applications and dependencies.
  • Identify use of DefaultAuthenticationSuccessHandler and DefaultAuthenticationFailureHandler.
  • Review authentication flows that accept _target_path or equivalent redirect targets.
  • Confirm redirect handling rejects or normalizes external absolute URLs.
  • Verify deployed package versions match the fixed Symfony releases or vendor security update.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2017-16652 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.