CVE-2026-40968
Last modified
CVE-2026-40968 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions. Affected versions: Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). EPSS estimates a 0.17% chance of exploitation in the next 30 days.
Description
When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions. Affected versions: Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Vmware | Spring Grpc | < 1.0.3 |
References
- https://spring.io/security/cve-2026-40968Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-40968?
How severe is CVE-2026-40968?
How do I fix CVE-2026-40968?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-40962FFmpeg before 8.1 has an integer overflow and resultant out-…9.8
- CVE-2026-40963The structure_data endpoint in the Airflow UI returned exter…3.1
- CVE-2026-40964Authentication Bypass in cf-auth-proxy in Cloud Foundry Foun…7.5
- CVE-2026-40965Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vul…10
- CVE-2026-40966In Spring AI, an attacker can bypass conversation isolation …5.9
- CVE-2026-40967In Spring AI, various FilterExpressionConverter implementati…8.6
- CVE-2026-40969The raw message of every server-side AuthenticationException…5.3
- CVE-2026-40970When configured to use an SSL bundle, Spring Boot's Elastics…6.8
- CVE-2026-40971When configured to use an SSL bundle, Spring Boot's RabbitMQ…9.1
- CVE-2026-40972An attacker on the same network as the remote application ma…7.5
- CVE-2026-40973A local attacker on the same host as the application may be …7
- CVE-2026-40974Spring Boot's Cassandra auto-configuration does not perform …9.8
Are you affected by CVE-2026-40968?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST