Cyber Resilience

CVE-2026-87743

Published
18 September 2026
Modified
18 September 2026
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score 0.0043 37th percentile
Risk Priority 57 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-87743 is a high-severity Incorrect Behavior Order: Authorization Before Parsing and Canonicalization (CWE-551) vulnerability. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 37th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

A flaw was found in Quarkus HTTP security. An unauthenticated attacker can exploit a discrepancy in how paths are normalized between the security matcher and HTTP request dispatchers. This allows the attacker to craft a URL that the security matcher…

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considers public, but which is then routed to a protected endpoint, leading to an authorization bypass and potential unauthorized access to sensitive information.

CWE(s)
CWE-551

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 →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

Affected Assets

Mitigating Controls

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 partial match
prevents

Secure SDLC practices directly require correct authorization logic after parsing/canonicalization to prevent bypasses.

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.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle requires proper URL parsing and canonicalization before authorization checks.

A.8.26 Application security requirements partial match
prevents

Application security requirements should mandate correct authorization order after canonicalization.

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

Secure architecture principles include proper request handling order to prevent bypasses.

A.8.28 Secure coding partial match
prevents

Secure coding practices directly address canonicalization and authorization sequencing flaws.

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

Security testing can detect this weakness but does not prevent it by itself.

A.8.3 Information access restriction partial match
mitigates

Information access restriction is undermined when authorization occurs before canonicalization.

References