Language: TypeScript
Label: safe
CWE: CWE-346 \u2014 Origin Validation Error
The product does not properly verify that the source of data or communication is valid.

Code:
            allowRequest: (req, callback) => {
                let isOriginValid = true;
                const bypass = isDev || process.env.UPTIME_KUMA_WS_ORIGIN_CHECK === "bypass";

                if (!bypass) {
                    let host = req.headers.host;

                    // If this is set, it means the request is from the browser
                    let origin = req.headers.origin;

                    // If this is from the browser, check if the origin is allowed
                    if (origin) {
                        try {
                            let originURL = new URL(origin);

                            if (host !== originURL.host) {
                                isOriginValid = false;
                                log.error("auth", `Origin (${origin}) does not match host (${host}), IP: ${req.socket.remoteAddress}`);
                            }
                        } catch (e) {
                            // Invalid origin url, probably not from browser
                            isOriginValid = false;
                            log.error("auth", `Invalid origin url (${origin}), IP: ${req.socket.remoteAddress}`);
                        }
                    } else {
                        log.info("auth", `Origin is not set, IP: ${req.socket.remoteAddress}`);
                    }
                } else {
                    log.debug("auth", "Origin check is bypassed");
                }

                callback(null, isOriginValid);
            }
        });
    }