Is CVE-2026-47775 actively exploited?

No active exploitation of CVE-2026-47775 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-47775 be exploited remotely?

Yes. CVE-2026-47775 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-47775?

CVE-2026-47775 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2026-47775

CWE-209Published: June 26, 2026· Updated: Jun 29, 2026

6.8

CVSS v3.1

EPSS:0.21%probability of exploitation in 30 daysPercentile:11.5th

Official Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HMAC, no AEAD). The /callback endpoint returns HTTP 302 on successful decryption and HTTP 401 on padding failure, creating a padding oracle. An attacker who obtains the encrypted CodeVerifier cookie can recover the plaintext PKCE code_verifier in ~6,200 requests (~100 seconds), then exchange it with a stolen authorization code to obtain the victim's access token. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.

NVD Source

Technical Analysis

CVE-2026-47775 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 6.8.