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CVE

CVE-2026-18918

OAuth 1.0 session-fixation chain via unauthenticated provisional-consumer registration and insecure v1_0Allowed default
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CVE

CVE-2026-18918

OAuth 1.0 session-fixation chain via unauthenticated provisional-consumer registration and insecure v1_0Allowed default

In Eclipse Lyo versions 2.0.0 to 7.0.0, OAuth server authorization checks can be bypassed when the 2-legged auth is supported by the server. In those cases, application that based their authz filters upon Lyo-provided AbstractAdapterCredentialsFilter, are vulnerable. An attacked can create a provisional trusted client (valid use-case) but then it can be used as a trusted client immediately without requiring the administrator approval to clear the provisional status. The 3-legged path requiring user interaction is not vulnerable and rejects provisional clients.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:L/U:Red
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/eclipse-lyo/lyo/releases/tag/v6.0.1.Final, https://github.com/eclipse-lyo/lyo/releases/tag/v7.0.0.Beta3, https://gitlab.eclipse.org/security/cve-assignment/-/work_items/221, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18918.json, https://nvd.nist.gov/vuln/detail/CVE-2026-18918

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00373%
EPSS Percentile
0.29204%
Introduced Version
0
Fix Available
b2aea6146e62e1f292aff2b5ab65086e9c82b1a5

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