CVE-2023-30845 json
ESPv2 vulnerable to JWT authentication bypass via `X-HTTP-Method-Override` header
published 2023-04-26 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-35198
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
ESPv2 is a service proxy that provides API management capabilities using Google Service Infrastructure. ESPv2 2.20.0 through 2.42.0 contains an authentication bypass vulnerability. API clients can craft a malicious `X-HTTP-Method-Override` header value to bypass JWT authentication in specific cases.
ESPv2 allows malicious requests to bypass authentication if both the conditions are true: The requested HTTP method is **not** in the API service definition (OpenAPI spec or gRPC `google.api.http` proto annotations, and the specified `X-HTTP-Method-Override` is a valid HTTP method in the API service definition. ESPv2 will forward the request to your backend without checking the JWT. Attackers can craft requests with a malicious `X-HTTP-Method-Override` value that allows them to bypass specifying JWTs. Restricting API access with API keys works as intended and is not affected by this vulnerability.
Upgrade deployments to release v2.43.0 or higher to receive a patch. This release ensures that JWT authentication occurs, even when the caller specifies `x-http-method-override`. `x-http-method-override` is still supported by v2.43.0+. API clients can continue sending this header to ESPv2.
Patch / fix
- google espv2 2.43.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 21 mo ago
Exploit prediction
0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- GoogleCloudPlatform esp-v2
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/GoogleCloudPlatform/esp-v2/commit/0bcdfc024ce96b34db4e1b4f2211b509d9be93cd
patch
-
github.com
/GoogleCloudPlatform/esp-v2/commit/e95670146f5e96bb5565b0a9c1e153886b3e04ce
patch
-
github.com
/GoogleCloudPlatform/esp-v2/commit/e98061ee4527a564506ba4e814c0ecf324dc2c6f
patch
-
github.com
/GoogleCloudPlatform/esp-v2/security/advisories/GHSA-6qmp-9p95-fc5f
vendor-advisory
Sources
- CVE List CVE-2023-30845
- NVD CVE-2023-30845
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