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CVE-2026-5430

Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover

CVSS 3.1 Critical 10.0Known exploited (CISA KEV)

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

Description

The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access. Successful exploitation of this vulnerability may result in unauthorized access to the system, including the potential compromise of administrative accounts and full account takeover. The CVSS score is adjusted to 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in single-tenant deployments, reflecting that the impact is contained within a single security authority boundary.

Official description from the CVE record, published by WSO2. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 Critical 10.0

Score published by WSO2 in the CVE record.

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

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Changed

    The impact can reach other components beyond the vulnerable one.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.22390 (22.4% probability)
Percentile
97.7%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
WSO2 Multiple Products Path Traversal Vulnerability
Added to the catalog
Sep 24, 2026
Federal due date
Sep 27, 2026

CISA assessment as of Sep 24, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
yes
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-347Improper Verification of Cryptographic Signature

Affected products

Products listed in the CVE record, as the CNA published them.

  • WSO2 Universal Gateway

    • affected: 4.5.0 up to before 4.5.0.57
    • affected: 4.6.0 up to before 4.6.0.21

  • WSO2 Traffic Manager

    • affected: 4.5.0 up to before 4.5.0.56
    • affected: 4.6.0 up to before 4.6.0.21

  • WSO2 API Control Plane

    • affected: 4.5.0 up to before 4.5.0.58
    • affected: 4.6.0 up to before 4.6.0.22

  • WSO2 API Manager

    • unknown: before 4.1.0
    • affected: 4.1.0 up to before 4.1.0.257
    • affected: 4.2.0 up to before 4.2.0.197
    • affected: 4.3.0 up to before 4.3.0.108
    • affected: 4.4.0 up to before 4.4.0.72
    • affected: 4.5.0 up to before 4.5.0.57
    • affected: 4.6.0 up to before 4.6.0.21

  • WSO2 Carbon API Manager Rest API Utility

    • affected: 9.20.74 up to before 9.20.74.401
    • affected: 9.28.116 up to before 9.28.116.417
    • affected: 9.29.120 up to before 9.29.120.236
    • affected: 9.30.67 up to before 9.30.67.167
    • affected: 9.31.86 up to before 9.31.86.158
    • affected: 9.32.147 up to before 9.32.147.59
    • unaffected: 9.33.106 up to *

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:37 UTC. Sources and licenses