Common Weakness Enumeration

CWE-551

Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.

CVE-2026-57920 (GCVE-0-2026-57920)

Vulnerability from cvelistv5 – Published: 2026-06-26 12:20 – Updated: 2026-06-26 13:32 Exclusively Hosted Service
VLAI
Summary
Peplink InControl 2 through 2.14.2 before 2026-06-03 allows use of a semicolon to bypass access-control rules for certain /rest/o/{orgId} endpoints.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Assigner
References
Impacted products
Vendor Product Version
Peplink InControl Affected: 0 , < 2026-06-03 (custom)
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Mitigation

Phase: Architecture and Design

Description:

  • URL Inputs should be decoded and canonicalized to the application's current internal representation before being validated and processed for authorization. Make sure that your application does not decode the same input twice. Such errors could be used to bypass allowlist schemes by introducing dangerous inputs after they have been checked.

No CAPEC attack patterns related to this CWE.

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