CVE-2026-57948: Pinpoint Session Management Vulnerability

CVE-2026-57948 Overview

CVE-2026-57948 is an insecure session management vulnerability affecting Pinpoint through version 3.1.0. The pinpointJwt session cookie is issued without the HttpOnly and Secure attributes. This exposes the cookie to JavaScript access through document.cookie and permits cleartext transmission over HTTP. Attackers can chain the issue with stored or reflected cross-site scripting (XSS) to exfiltrate session tokens. Network attackers positioned on the transport path can also intercept the cookie through passive sniffing. Successful exploitation enables session hijacking against authenticated Pinpoint users. The weakness is categorized under CWE-614, Sensitive Cookie in HTTPS Session Without 'Secure' Attribute.

Critical Impact
Attackers who obtain the pinpointJwt cookie can impersonate authenticated users and access application performance monitoring data without credentials.

Affected Products

Pinpoint APM through version 3.1.0
Deployments serving the web UI over HTTP
Instances with any XSS sink reachable by authenticated users

Discovery Timeline

2026-06-29 - CVE-2026-57948 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-57948

Vulnerability Analysis

Pinpoint issues the pinpointJwt cookie to track authenticated user sessions. The cookie carries a JSON Web Token used for subsequent authorization decisions. The server sets this cookie without the HttpOnly flag, so client-side JavaScript can read it through document.cookie. The server also omits the Secure flag, so browsers transmit the cookie over plaintext HTTP connections when TLS is absent or downgraded.

The vulnerability aligns with CWE-614 and reflects a broader failure to apply defense-in-depth cookie hardening. Because the JWT functions as a bearer token, any exposure of the cookie value grants full session takeover until the token expires.

Root Cause

The root cause is missing cookie security attributes in the server response that establishes the Pinpoint session. The Set-Cookie header for pinpointJwt lacks both HttpOnly and Secure directives. Without these directives, browsers treat the cookie as accessible to scripts and eligible for transmission over unencrypted channels.

Attack Vector

Two primary attack paths exist. First, an attacker who identifies a stored or reflected XSS sink in the Pinpoint web interface can inject JavaScript that reads document.cookie and posts the token to an attacker-controlled endpoint. Second, an attacker with network access to the traffic path can capture the cookie in transit when Pinpoint is served over HTTP. The captured JWT is then replayed against the Pinpoint application to authenticate as the victim. See the VulnCheck Security Advisory and the GitHub Issue Discussion for further technical context.

Detection Methods for CVE-2026-57948

Indicators of Compromise

Unexpected outbound HTTP requests from browsers containing pinpointJwt values in query strings or POST bodies
Pinpoint access logs showing the same JWT used from multiple geographically distant IP addresses
Concurrent active sessions for a single Pinpoint account originating from different user agents
HTTP response headers from Pinpoint containing Set-Cookie: pinpointJwt=... without HttpOnly or Secure flags

Detection Strategies

Inspect Pinpoint HTTP responses for cookie attributes using automated scanners or curl -I and flag any pinpointJwt cookie missing HttpOnly; Secure
Correlate authentication events in Pinpoint logs to identify session reuse from mismatched source IPs or user-agent strings
Monitor reverse-proxy or WAF telemetry for anomalous outbound traffic from browsers immediately after Pinpoint page loads

Monitoring Recommendations

Alert on any Pinpoint traffic served over plaintext HTTP on port 80
Track failed and successful logins for the same account across disparate ASN or country boundaries within short time windows
Log and review any Content-Security-Policy violations reported by browsers accessing the Pinpoint UI

How to Mitigate CVE-2026-57948

Immediate Actions Required

Terminate the Pinpoint web UI behind HTTPS only and redirect all HTTP requests to TLS
Configure the reverse proxy or ingress in front of Pinpoint to append HttpOnly and Secure attributes to the pinpointJwt cookie
Invalidate existing pinpointJwt sessions and require reauthentication for all users
Audit the Pinpoint UI for XSS sinks that could be used to read cookies

Patch Information

No vendor patch is referenced in the enriched advisory data at time of publication. Track the GitHub Issue Discussion and the VulnCheck Security Advisory for updates from the Pinpoint APM project.

Workarounds

Rewrite Set-Cookie headers at an NGINX, HAProxy, or Envoy proxy layer to inject HttpOnly; Secure; SameSite=Strict for pinpointJwt
Enforce HTTP Strict Transport Security (HSTS) with a long max-age to prevent cleartext downgrades
Restrict Pinpoint UI access to trusted networks or place it behind an authenticated VPN until upstream hardening ships
Deploy a strict Content-Security-Policy header to reduce the impact of any XSS that targets the cookie

bash

# NGINX example: rewrite pinpointJwt cookie to add HttpOnly and Secure
proxy_cookie_flags pinpointJwt httponly secure samesite=strict;

# Force HTTPS and set HSTS
server {
    listen 80;
    server_name pinpoint.example.com;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    server_name pinpoint.example.com;
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains" always;
    add_header Content-Security-Policy "default-src 'self'" always;
    location / {
        proxy_pass http://pinpoint_upstream;
        proxy_cookie_flags pinpointJwt httponly secure samesite=strict;
    }
}