CVE-2026-5430 (GCVE-0-2026-5430)
Vulnerability from cvelistv5 – Published: 2026-08-06 07:33 – Updated: 2026-08-06 07:33
VLAI
EPSS
VEX
Title
Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
Summary
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.
Severity
10 (Critical)
CWE
- CWE-347 - Improper Validation of Certificate With Host Mismatch
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://security.docs.wso2.com/en/latest/security… | vendor-advisory |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| WSO2 | WSO2 Universal Gateway |
Affected:
4.5.0 , < 4.5.0.57
(custom)
Affected: 4.6.0 , < 4.6.0.21 (custom) |
|
| WSO2 | WSO2 Traffic Manager |
Affected:
4.5.0 , < 4.5.0.56
(custom)
Affected: 4.6.0 , < 4.6.0.21 (custom) |
|
| WSO2 | WSO2 API Control Plane |
Affected:
4.5.0 , < 4.5.0.58
(custom)
Affected: 4.6.0 , < 4.6.0.22 (custom) |
|
| WSO2 | WSO2 API Manager |
Unknown:
0 , < 4.1.0
(custom)
Affected: 4.1.0 , < 4.1.0.257 (custom) Affected: 4.2.0 , < 4.2.0.197 (custom) Affected: 4.3.0 , < 4.3.0.108 (custom) Affected: 4.4.0 , < 4.4.0.72 (custom) Affected: 4.5.0 , < 4.5.0.57 (custom) Affected: 4.6.0 , < 4.6.0.21 (custom) |
|
| WSO2 | WSO2 Carbon API Manager Rest API Utility |
Affected:
9.20.74 , < 9.20.74.401
(custom)
Affected: 9.28.116 , < 9.28.116.417 (custom) Affected: 9.29.120 , < 9.29.120.236 (custom) Affected: 9.30.67 , < 9.30.67.167 (custom) Affected: 9.31.86 , < 9.31.86.158 (custom) Affected: 9.32.147 , < 9.32.147.59 (custom) Unaffected: 9.33.106 , ≤ * (custom) |
Credits
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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