CVE-2023-30845 is a critical authentication bypass vulnerability affecting Google ESPv2 versions 2.20.0 through 2.42.0. Attackers can bypass JWT authentication by crafting a malicious X-HTTP-Method-Override header, allowing unauthorized access to backend services if the requested HTTP method is not in the API service definition, but the overridden method is. With a CVSS score of 9.8 (Critical), this vulnerability poses a high risk of complete compromise (confidentiality, integrity, availability) due to its network-based attack vector and low attack complexity. While there is no evidence of active exploitation, public exploit code, or significant community discussion, affected organizations should upgrade to ESPv2 v2.43.0 or higher immediately to patch this flaw.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.20.0, < 2.43.0CPE matchmatch criteria | cpe:2.3:a:google:espv2:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
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