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GHSA-5j35-xr4g-vwf4

LowCVSS 2.3 / 10
Published Mar 25, 2026·Last modified Mar 25, 2026
Affected Components(0)

No affected components available

Description

Impact

The session cookie is set with HttpOnly; SameSite=Lax; Path=/ but does not include the Secure flag. This means the cookie will be sent over plain HTTP connections.

Since the server binds to 127.0.0.1 by default and uses HTTP (not HTTPS), this is acceptable for localhost use. However, when --allow-network is used to bind to 0.0.0.0, cookies could be transmitted over insecure network connections and intercepted by an attacker.

Affected code:

  • packages/server/src/session.ts:76 — cookie string lacks ; Secure attribute

Patches

0.70.5

Fix: Conditionally add ; Secure when served over HTTPS or when --allow-network is enabled:

const securePart = isHttps ? "; Secure" : "";
return `${SESSION_COOKIE_NAME}=${cookieValue}; HttpOnly; SameSite=Lax; Path=/${securePart}; Max-Age=${maxAge}`;

Workarounds

Do not use --allow-network over untrusted networks without a TLS-terminating reverse proxy.

Resources

  • OWASP: Secure Cookie Attribute
  • File: packages/server/src/session.ts
Risk Scores
Base Score
2.3

The vulnerability can be exploited over a local network, such as Wi-Fi. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
0.6

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Low severity
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