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TI-2026-82178 Aliases CVE-2026-6647GHSA-rxrw-f2xj-7fjx

WSO2 Identity Server keeps OAuth tokens of mixed-case users valid

Priority LOW 32CWE-613Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

WSO2 Identity Server from 7.2.0 before 7.2.0.21 and WSO2 Carbon OAuth from 7.0.385 before 7.0.385.17 are affected. With a case-insensitive user store and a case-sensitive database, token revocation misses mixed-case usernames during some lifecycle events, leaving tokens valid (CWE-613). An attacker with low privileges who holds a valid access or refresh token for a mixed-case username can keep using it before expiry to bypass intended access controls.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

In deployments of WSO2 Identity Server configured with a case-insensitive user store and a case-sensitive database for identity data, mismatches in username case handling can occur. This inconsistency results in OAuth token revocation operations failing to correctly identify usernames containing mixed-case characters during certain lifecycle events, preventing tokens from being invalidated. A malicious actor can exploit this vulnerability by possessing a valid access or refresh token associated with a mixed-case username. In affected configurations, these tokens may not be revoked when expected. The actor can then leverage these unrevoked tokens, before their expiry, to continue performing actions that should have been restricted, effectively bypassing intended access controls.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00212 11th percentileScored 2026-11-07
Fix Fixed WSO2 Identity Server (WSO2): 7.2.0.21WSO2 Carbon OAuth (WSO2): 7.0.385.17, 7.5.23

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WSO2WSO2 Identity Server7.2.0 to before 7.2.0.217.2.0.21Patch availableCNA
WSO2WSO2 Carbon OAuth7.0.385 to before 7.0.385.177.0.385.17, 7.5.23Patch availableCNA
  • WSO2 Identity Server VendorWSO2 Affected 7.2.0 to before 7.2.0.21 Fixed in 7.2.0.21 Patch available CNA
  • WSO2 Carbon OAuth VendorWSO2 Affected 7.0.385 to before 7.0.385.17 Fixed in 7.0.385.17, 7.5.23 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:wso2:identity_server:*:*:*:*:*:*:*:*——WSO2
  • cpe:2.3:a:wso2:identity_server:*:*:*:*:*:*:*:* Versions — — ·WSO2

Remediation

Upgrade WSO2 Identity Server to 7.2.0.21 and WSO2 Carbon OAuth to 7.0.385.17 or 7.5.23.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA WSO2 Identity Server (WSO2) Fixed in 7.2.0.21
  • Fix · CNA WSO2 Carbon OAuth (WSO2) Fixed in 7.0.385.17, 7.5.23

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-6647
  2. 2026-10-28 Alias added: GHSA-rxrw-f2xj-7fjx
  3. 2026-10-29 CISA SSVC decision points changed
  4. 2026-10-29 Priority changed: MEDIUM → LOW

References

Advisory 1

  • TI-2026-04755 Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover KEVCVSS 3.1CRITICAL 10.0
  • TI-2022-11928 Certain WSO2 products allow unrestricted file upload with resultant remote code execution. KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-18808 An issue was discovered in WSO2 Enterprise Integrator 6.4.0. CVSS 3.1MEDIUM 6.1
  • TI-2020-15069 The Management Console in WSO2 API Manager through 3.1.0 and API Microgateway 2.2.0… CVSS 3.1CRITICAL 9.1
  • TI-2023-15163 A reflected cross-site scripting (XSS) vulnerability in /authenticationendpoint/login.do… CVSS 3.1MEDIUM 6.1
  • TI-2022-04130 WSO2 carbon-registry Advanced Search advancedSearchForm-ajaxprocessor.jsp cross site scripting CVSS 3.1MEDIUM 6.1
See all 186 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences