GHSA-vhr5-ggp3-qq85 · 深刻度： medium · エコシステム： go — Ory Oathkeeper has an authentication bypass by usage of untrusted header
ORY Oathkeeper is an Identity & Access Proxy (IAP) and Access Control Decision API that authorizes HTTP requests based on sets of Access Rules. Ory Oathkeeper is often deployed behind other components like CDNs, WAFs, or reverse proxies. Depending on the setup, another component might forward the request to the Oathkeeper proxy with a different protocol (http vs. https) than the original request. In order to properly match the request against the configured rules, Oathkeeper considers the `X-Forwarded-Proto` header when evaluating rules. The configuration option `serve.proxy.trust_forwarded_headers` (defaults to false) governs whether this and other `X-Forwarded-*` headers should be trusted. Prior to version 26.2.0, Oathkeeper did not properly respect this configuration, and would always consider the `X-Forwarded-Proto` header. In order for an attacker to abuse this, an installation of Ory Oathkeeper needs to have distinct rules for HTTP and HTTPS requests. Also, the attacker needs to be able to trigger one but not the other rule. In this scenario, the attacker can send the same request but with the `X-Forwarded-Proto` header in order to trigger the other rule. We do not expect many configurations to meet these preconditions. Version 26.2.0 contains a patch. Ory Oathkeeper will correctly respect the `serve.proxy.trust_forwarded_headers` configuration going forward, thereby eliminating the attack scenario. We recommend upgrading to a fixed version even if the preconditions are not met. As an additional mitigation, it is generally recommended to drop any unexpected headers as early as possible when a request is handled, e.g. in the WAF.
総合評価: CVE-2026-33495 は低リスク（31.1/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.23%、14 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.03% | 0.23% | +0.21% |
| 2 | 2026-03-27 | — | 0.03% | — |
EPSS の全履歴 （全 2 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
3.9 | 2.5 | [email protected] |
GHSA-vhr5-ggp3-qq85 · 深刻度： medium · エコシステム： go — Ory Oathkeeper has an authentication bypass by usage of untrusted header
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| ory | oathkeeper | < 26.2.0 | cpe:2.3:a:ory:oathkeeper:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://github.com/ory/oathkeeper/commit/e9acca14a04d246250557550065e4b4576525bd5 | Patch |
| https://github.com/ory/oathkeeper/security/advisories/GHSA-vhr5-ggp3-qq85 | Mitigation Vendor Advisory |